Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Dodge and Ram ProMaster City BaseFACTORY OEM SERVICE PROCEDURE
Module, Trailer Tow
DIAGNOSTIC CODE INDEX
| DTC | Description |
|---|---|
| B1000-96 | ELECTRONIC CONTROL UNIT - COMPONENT INTERNAL FAILURE |
| C1005-11 | TURN LEFT LIGHT COMMAND - CIRCUIT SHORT TO GROUND |
| C1005-12 | TURN LEFT LIGHT COMMAND - CIRCUIT SHORT TO BATTERY |
| C1005-13 | TURN LEFT LIGHT COMMAND - CIRCUIT OPEN |
| C1006-11 | TURN RIGHT LIGHT COMMAND - CIRCUIT SHORT TO GROUND |
| C1006-12 | TURN RIGHT LIGHT COMMAND - CIRCUIT SHORT TO BATTERY |
| C1006-13 | TURN RIGHT LIGHT COMMAND - CIRCUIT OPEN |
| C104C-11 | REVERSE LIGHT COMMAND - CIRCUIT SHORT TO GROUND |
| C104C-12 | REVERSE LIGHT COMMAND - CIRCUIT SHORT TO BATTERY |
| C104D-11 | POSITION RIGHT LIGHT COMMAND - CIRCUIT SHORT TO GROUND |
| C104D-12 | POSITION RIGHT LIGHT COMMAND - CIRCUIT SHORT TO BATTERY |
| C104D-13 | POSITION RIGHT LIGHT COMMAND - CIRCUIT OPEN |
| C104E-11 | POSITION LEFT LIGHT COMMAND - CIRCUIT SHORT TO GROUND |
| C104E-12 | POSITION LEFT LIGHT COMMAND - CIRCUIT SHORT TO BATTERY |
| C104E-13 | POSITION LEFT LIGHT COMMAND - CIRCUIT OPEN |
| C104F-64 | TRAILER CONNECTED STATUS - SIGNAL PLAUSIBILITY FAILURE |
| C105B-64 | TURN LIGHT REAR LEFT - SIGNAL PLAUSIBILITY FAILURE |
| C105C-64 | TURN LIGHT REAR RIGHT - SIGNAL PLAUSIBILITY FAILURE |
| C105D-8F | VEHICLE SPEED ERROR - ERRATIC |
| C106D-11 | STOP LEFT/RIGHT LIGHT COMMAND - CIRCUIT SHORT TO GROUND |
| C106D-12 | STOP LEFT/RIGHT LIGHT COMMAND - CIRCUIT SHORT TO BATTERY |
| C106D-13 | STOP LEFT/RIGHT LIGHT COMMAND - CIRCUIT OPEN |
| U0019-87 | CAN B BUS-MISSING MESSAGE |
| U0019-88 | CAN B BUS-BUS OFF |
| U1700-86 | BCM BODY COMPUTER MODULE - SIGNAL INVALID |
| U1700-87 | BCM BODY COMPUTER MODULE - MISSING MESSAGE |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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