Mercedes-Benz ETC Diagnostic Trouble Codes (DTCs)
Understanding ETC Diagnostic Trouble Codes
This document provides a reference for Diagnostic Trouble Codes (DTCs) related to the Electronic Transmission Control (ETC) system for Mercedes-Benz model 163 and other compatible vehicles. The Hand-Held Tester (HHT) is used to read DTCs, which will indicate defective electrical components and refer to specific test steps in the Diagnostic Manual.
Before proceeding with diagnosis, review section 11 and this guide. Key steps include checking and correcting the AFT level, verifying AFT condition, connecting the HHT to the data link connector (X11/4), and performing a Quick Test. The HHT display will show defective components or direct to relevant test steps. To further localize intermittent DTCs or identify root causes, subtract 96 from the displayed value (098 to 161) to determine the relevant DTC. Additional information for a displayed DTC can be retrieved by pressing the enter key.
If multiple DTCs are stored in the ETC or ME-SFI memory, further tests like comparing nominal and actual values or activating components can be performed using the HHT. If no DTCs are stored, the issue may be hydraulic-mechanical; in such cases, proceed with the Complaint Related Diagnostic Chart (see 13/1). For USA vehicles, an illuminated "CHECK ENGINE" MIL (A1e26) will correspond to DTCs in the engine control module memory. Transmission adaptation (adaption of the ETC) is detailed in section 11.
DTC Reference Table
| DTC | DTC (intermittent) | DTC (OBD) | Note | Possible Cause | Test step/Remedy 1) |
|---|---|---|---|---|---|
| 002 | 098 | PO 753 | Valid for diagnostic version 0-6, 13, 20 | 1-2/4-5 shift solenoid valve (Y3/6y3) | Wiring, plug connectors, 1-2/4-5 shift solenoid valve (Y3/6y3), 23 4.0, see 13/16 |
| 003 | 099 | PO 758 | Valid for diagnostic version 0-6, 13, 20 | 2-3 shift solenoid valve (Y3/6y5) | Wiring, plug connectors 2-3 shift solenoid valve (Y3/6y5), 23 5.0, see 13/16 |
| 004 | 100 | PO 763 | Valid for diagnostic version 0-6, 13, 20 | 3-4 shift solenoid valve (Y3/6y4) | Wiring, plug connectors. 3-4 shift solenoid valve (Y3/6y4), 23 6.0, see 13/16 |
| 005 | 101 | PO 743 | Valid for diagnostic version 0-6, 13, 20 | PWM solenoid valve (Y3/6y6) (torque converter lock-up) | Wiring, plug connectors. PWM solenoid (Y3/6y6), 23 7.0, see 13/16 |
| 006 | 102 | PO 748 | Valid for diagnostic version 0-6, 13, 20 | Modulating pressure regulating solenoid valve (Y3/6y1) | Wiring, plug connectors. Modulating pressure regulating solenoid valve (Y3/6y1), 23 8.0, see 13/16 |
| 007 | 103 | PO 748 | Valid for diagnostic version 0-6, 13, 20 | Shift pressure regulating solenoid valve (Y3/6y2) | Wiring, plug connectors. Shift pressure regulating solenoid valve (Y3/6y2), 23 9.0, see 13/16 |
| 008 | 104 | -- | Valid for diagnostic version 0-6 | R/P-lock solenoid (Y66/1) | Wiring, plug connectors. R/P-lock solenoid (Y66/1), 23 10.0 |
| 009 | 105 | -- | Valid for diagnostic version 0-6 | Starter lock-out relay module (K38/3) (fault is in the line). | Wiring, plug connectors, Model 140, 129: Starter lock-out relay module (K38/3), Model 210: Pulse module (N65), 23 11.0 |
| 010 | 106 | PO 702 | Valid for diagnostic version 0-6, 13, 20 | Voltage supply to solenoid valves | Wiring, plug connectors. 23 3.0 |
| 011 | 107 | PO 715 | Valid for diagnostic version 0-6, 13, 20 | Voltage supply to rpm sensors | Wiring, plug connectors. 23 12.0 |
| 012 | 108 | PO 715 | Valid for diagnostic version 0-6, 13, 20 | RPM sensor 2 (Y3/6n2) | Wiring, plug connectors. RPM sensor 2 (Y3/6n2), see 13/16 |
| 013 | 109 | PO 715 | Valid for diagnostic version 0-6, 13, 20 | RPM sensor 3 (Y3/6n3) | Wiring, plug connectors. RPM sensor 3 (Y3/6n3), see 13/16 |
| 014 | 110 | PO 715 | Valid for diagnostic version 6, 13, 20 | RPM sensor comparison: RPM sensor 2 (Y3/6n2) to RPM sensor 3 (Y3/6n3), implausible | If RPM semsor 2 or 3 are faulty, switch electrical set. If impulse wheel is loose for RPM sensor 2 or 3, repair transmission or replace transmission. See 13/16 |
| 015 | 111 | PO 700 | Valid for diagnostic version 6, 13, 20 | Excessive RPM: RPM sensor 2 (Y3/6n2) or RPM sensor 3 (Y3/6n3) | Wiring, plug connectors. |
| 016 | 112 | -- | Valid for diagnostic version 0-6, 13, 20 | Transmission selector lever coding | Wiring, plug connectors. |
| 017 | 113 | PO 705 | Valid for diagnostic version 4, 5, 6 | Transmission selector lever implausible | Wiring, plug connectors. |
| 017 | 113 | PO 705 | Valid for diagnostic version 0, 1, 2, 3 | Transmission selector lever between ranges | See 13/17 |
| 018 | 114 | -- | Valid for diagnostic version 4, 5, 6 | Temperature sensor (Y3/6b1) defective | Wiring, plug connectors. |
| 019 | 115 | -- | Valid for diagnostic version 0, 1, 2 | Starter lock-out contact (Y3/6s1) not functioning | Wiring, plug connectors. Starter lock-out contact (Y3/6s1), 23 13.0, see 13/17 |
| 020 | 116 | -- | Valid for diagnostic version 0, 1, 2 | Temperature sensor (Y3/6b1) faulty, Starter lock-out contact (Y3/6s1) no function | Starter lock-out contact (Y3/6s1), 23 13.0, see 13/17 |
| 021 | 117 | -- | Valid for diagnostic version 3, 4, 5, 6, 13, 20 | Circuit 87 voltage supply fault (low or overvoltage) | Wiring, plug connectors. 23 1.0 |
| 022 | 118 | PO 720 | Valid for diagnostic version 0-6, 13, 20 | CAN: Right rear wheel speed (VSS) from traction system implausible | Wiring, plug connectors. |
| 023 | 119 | PO 720 | Valid for diagnostic version 0-6, 13, 20 | CAN: Left rear wheel speed (VSS) from traction system implausible | Wiring, plug connectors. |
| 024 | 120 | -- | Valid for diagnostic version 2-6, 13, 20 | CAN: Pedal value from engine management implausible | See 13/17 |
| 024 | 120 | -- | Valid for diagnostic version 0, 1 | CAN: Right front wheel speed (VSS) from traction system implausible | See 13/17 |
| 025 | 121 | -- | Valid for diagnostic version 2-6, 13, 20 | CAN: Engine rpm from engine management implausible | See 13/17 |
| 025 | 121 | -- | Valid for diagnostic version 0, 1 | CAN: Left front wheel speed (VSS) from tracton system implausible | See 13/17 |
| 026 | 122 | -- | Valid for diagnostic version 2-6, 13, 20 | CAN: Right engine torque from engine management implauslible | See 13/17 |
| 026 | 122 | -- | Valid for diagnostic version 0, 1 | CAN: Pedal value from engine management implausible | See 13/17 |
| 027 | 123 | -- | Valid for diagnostic version 2, 3, 4, 5, 6, 13, 20 | CAN: Adjusted engine torque implausible | See 13/17 |
| 027 | 123 | -- | Valid for diagnostic version 0, 1 | Altitude adjustment factor from engine management implausible (This code can be ignored only if no code was set in ME-SFI) | See 13/17 |
| 027 | 123 | -- | Valid for diagnostic version 20 | CAN: Static engine torque implausible | See 13/17 |
| 028 | 124 | -- | Valid for diagnostic version 0,1 | CAN: Engine rpm from engine management implausible | See 13/17 |
| 028 | 124 | -- | Valid for diagnostic version 2, 3, 4, 5, 6, 13, 20 | CAN: Left engine torque from engine management implausible | See 13/17 |
| 029 | 125 | -- | Valid for diagnostic version 2, 3, 4, 5, 6, 13 | CAN: Right engine torque from engine management implausible | See 13/17 |
| 029 | 125 | -- | Valid for diagnostic version 20 | CAN: Minimal engine torque from engine management implausible | See 13/17 |
| 030 | 126 | -- | Valid for diagnostic version 0,1 | CAN: Communication to traction system faulty | See 13/17 |
| 031 | 127 | -- | Valid for diagnostic version 2-6, 13, 20 | CAN: Altitude correction factor from engine management implausible (This code can be ignored only if no code was set in ME-SFI) | See 13/17 |
| 031 | 127 | -- | Valid for diagnostic version 0,1 | CAN: Engine management communication faulty | See 13/17 |
| 031 | 127 | -- | Valid for diagnostic version 3, 13, 20 | CAN: Maximum induced engine torque from engine management implausible | See 13/17 |
| 032 | 128 | -- | Valid for diagnostic version 4, 5, 6, except engines 119 and 120 | CAN: Maximum induced engine torque from engine management implausible | See 13/17 |
| 032 | 128 | -- | Valid for diagnostic version 0, 1 | CAN: Engine management communication faulty | See 13/17 |
| 033 | 129 | -- | Valid for diagnostic version 3, 4, 5, 6, 13 | CAN: Engine torque requirement for traction system from engine management implausible | See 13/17 |
| 033 | 129 | -- | Valid for diagnostic version 0,1 | CAN: Engine management communication faulty | See 13/17 |
| 034 | 130 | PO 750 | Valid for diagnostic version 0, 1, For engine 120 only | CAN: Throttle valve actuator actual value from engine management implausible | See 13/17 |
| 034 | 130 | PO 720 | Valid for diagnostic version 13, 20 | CAN: Engine management communication faulty | See 13/17 |
| 035 | 131 | -- | Valid for diagnostic version 0-6, For engine 120 only | CAN: Communication with Electronic selector lever module control module (N15/5) faulty | See Star Diagnosis, Read out DTC memory for Electronic Selector Lever Module Control Module (N15/5). |
| 036 | 132 | -- | Valid for diagnostic version 0-6, 13, 20 | Transmission selector lever version coding implausible | See 13/17 |
| 037 | 133 | -- | Valid for diagnostic version 0-5 | CAN: All communication faulty | See 13/17 |
| 037 | 133 | -- | Valid for diagnostic version 13, 20 | CAN: Line faulty (bus-off) | Check lines from data buse. See 13/17 |
| 038 | 134 | PO 720 | Valid for diagnostic version 2, 3, 4, 5, 6, 13, 20 | CAN: Traction system communication faulty | See 13/17 |
| 039 | 135 | -- | Valid for diagnostic version 2, 3, 4, 5, 6, 13, 20 | CAN: Engine management communication faulty | See 13/17 |
| 040 | 136 | -- | Valid for diagnostic version 3 | CAN: Instrument cluster communication faulty | See STAR diagnosis, Readout DTCs' for EIS and instrument cluster (A1) |
| 040 | 136 | -- | Valid for diagnostic version 4, 5, 6, except engines 119 and 120 | CAN: Instrument cluster communication faulty | See STAR diagnosis, Readout DTCs' for EIS and instrument cluster (A1) |
| 040 | 136 | -- | Valid for diagnostic version 13, 20 | CAN: Instrument cluster communication faulty, CAN: Electronic ignition switch (EIS) communication faulty | See STAR diagnosis, Readout DTCs' for EIS and instrument cluster (A1) |
| 041 | 137 | PO 700 | Valid for diagnostic version 3, 4, 5, 6 | CAN: Communication with transfer case control module faulty | See 13/17 |
| 041 | 137 | PO 700 | Valid for diagnostic version Except For engine 119/120 | CAN: Communication with transfer case control module faulty | See 13/17 |
| 049 | 145 | PO 700 | Valid for diagnostic version 13, 20 | Excessive engine RPM | See 13/17 |
| 050 | 146 | PO 700 | Valid for diagnostic version 3, 4, 5 | Execessive RPM: RPM sensor 3 (Y3/6n3) or Externally toothed plate gear | See 13/17 |
| 051 | 146 | PO 700 | Valid for diagnostic version 6, 13, 20 | Non-acceptable transmission gear ratio | See 13/18 |
| 051 | 147 | PO 700 | Valid for diagnostic version 0-6, 13, 20 | Gear implausible or transmission slips | See 13/18 |
| 052 | 148 | PO 700 | Valid for diagnostic version 0, 1, 2 | Command valve (6, 14 or 25) sticking under pressure | See 13/24 |
| 052 | 148 | PO 700 | Valid for diagnostic version 3, 4, 5, 6, 13, 20 | Torque converter lock-up clutch: unauthorized lock | See 13/18 |
| 053 | 149 | PO 740 | Valid for diagnostic version 0, 1, 2 | Torque converter lock-up clutch: not functioning | See 13/18 |
| 053 | 149 | PO 740 | Valid for diagnostic version 3, 4, 5, 6, 13, 20 | Torque converter lock-up clutch: input too high | See 13/18 |
| 054 | 150 | -- | Valid for diagnostic version 0-6, 13, 20 | No transmission overload protection (return signal) | |
| 055 | 151 | PO 730 | Valid for diagnostic version 0-6, 13, 20 | Gear comparison or selected gear not attained | See 13/19 |
| 056-059 | 152-155 | PO 702 | Valid for diagnostic version 0-6, 13, 20 | Fault in transmission control module (N15/3) | Wiring, plug connections. N15/3 |
| 060-061 | 156-157 | -- | Valid for diagnostic version 0-6, 13, 20 | Fault in transmission control module (N15/3) | Wiring, plug connections. N15/3 |
| 062-064 | 158-160 | PO 702 | Valid for diagnostic version 0-6, 13, 20 | Fault in transmission control module (N15/3) | Wiring, plug connections. N15/3, see 13/19 |
| 065 | 161 | -- | Valid for diagnostic version 0-6, 13, 20 | Fault in transmission control module (N15/3) | Wiring, plug connections. N15/3 |
