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.
2006 Volvo C70 AutomaticFACTORY OEM SERVICE PROCEDURE
Trailer Module (TRM) DTCS
TRAILER MODULE (TRM) - DTC INDEX
| DTC | Description |
|---|---|
| TRM-1A03 | Control module. Internal fault |
| TRM-1A04 | Control module. Internal fault |
| TRM-8B01 | Parking lamps. Signal too low |
| TRM-8B02 | Parking lamps. Signal too high |
| TRM-8C01 | Fog lamps. Signal too low |
| TRM-8C02 | Fog lamps. Signal too high |
| TRM-8D01 | Left-hand stop lamp. Signal too low |
| TRM-8D02 | Left-hand stop lamp. Signal too high |
| TRM-8D03 | Right-hand stop lamp. Signal too low |
| TRM-8D04 | Right-hand stop lamp. Signal too high |
| TRM-8D05 | Stop lamps. Faulty signal |
| TRM-8E01 | Back-up (reversing) lamp. Signal too low |
| TRM-8E02 | Back-up (reversing) lamp. Signal too high |
| TRM-8F01 | Left turn signal lamp. Signal too low |
| TRM-8F02 | Left turn signal lamp. Signal too high |
| TRM-8F03 | Right turn signal lamp. Signal too low |
| TRM-8F04 | Right turn signal lamp. Signal too high |
| TRM-E001 | Control module communication. Faulty communication |
| TRM-E003 | Configuration fault. Faulty configuration |
| TRM-E010 | Power supply. Voltage difference too great |
| TRM-XXXX | Unknown diagnostic trouble code (DTC) for the current control module version |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.