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.
2004 Volvo S80 Base, 2.9 92FACTORY OEM SERVICE PROCEDURE
Rear Electronic Module (Rem) DTCS
REAR ELECTRONIC MODULE (REM) - DTC INDEX
| DTC | Description |
|---|---|
| REM-1A01 | 30-Power supply. Signal too low. Intermittent fault |
| REM-1A01 | 30-Power supply. Signal too low. Permanent fault |
| REM-1A04 | Relay, 15I supply. Signal too high |
| REM-1A05 | Relay, 15I supply. Signal too low |
| REM-1D01 | Control unit. Internal fault. Intermittent fault |
| REM-1D01 | Control unit. Internal fault. Permanent fault |
| REM-1D02 | Control unit software. Internal fault. Intermittent fault |
| REM-1D02 | Control unit software. Internal fault. Permanent fault |
| REM-1D03 | Control unit not fully programmed. Internal fault. Intermittent fault |
| REM-1D03 | Control unit not fully programmed. Internal fault. Permanent fault |
| REM-1D07 | Control unit. Internal fault. Intermittent fault |
| REM-1D07 | Control unit. Internal fault. Permanent fault |
| REM-3FD3 | Relay, gas tank valve. Signal too low |
| REM-4A31 | Fuel gauge sensor. Signal faulty. Intermittent fault |
| REM-4A31 | Fuel gauge sensor. Signal faulty. Permanent fault |
| REM-4A33 | Fuel gauge sensor. Signal too high/Signal missing. Intermittent fault |
| REM-4A33 | Fuel gauge sensor. Signal too high/Signal missing. Permanent fault |
| REM-4A34 | Fuel gauge sensor. Signal too low. Intermittent fault |
| REM-4A34 | Fuel gauge sensor. Signal too low. Permanent fault |
| REM-4A35 | Fuel gauge sensor. Signal faulty. Intermittent fault |
| REM-4A35 | Fuel gauge sensor. Signal faulty. Permanent fault |
| REM-4A37 | Fuel gauge sensor. Signal too high/Signal missing. Intermittent fault |
| REM-4A37 | Fuel gauge sensor. Signal too high/Signal missing. Permanent fault |
| REM-4A38 | Fuel gauge sensor. Signal too low. Intermittent fault |
| REM-4A38 | Fuel gauge sensor. Signal too low. Permanent fault |
| REM-4A39 | Fuel level, gas. Signal too low |
| REM-4A40 | Gas temperature sensor. Signal too high |
| REM-4A41 | Gas temperature sensor. Signal too low |
| REM-4A42 | Gas pressure sensor. Signal too high |
| REM-4A43 | Gas pressure sensor. Signal too low |
| REM-4A44 | Fuel level, gas. Faulty signal |
| REM-4A45 | Fuel level, gas. Signal too high |
| REM-4A46 | Fuel level, gas. Signal too low |
| REM-4F41 | Communication with parking assistance module (PAM). Signal missing |
| REM-4F42 | Back-up warning sensor 1. Faulty signal |
| REM-4F43 | Back-up warning sensor 2. Faulty signal |
| REM-4F44 | Back-up warning sensor 3. Faulty signal |
| REM-4F45 | Back-up warning sensor 4. Faulty signal |
| REM-4F4A | Parking assistance module (PAM). Faulty signal |
| REM-4F90 | Sensor, seat belt reminder. Signal too high |
| REM-4F91 | Sensor, seat belt reminder. Signal too low |
| REM-4F92 | Sensor, seat belt reminder. Signal missing |
| REM-4F93 | Sensor, seat belt reminder. Faulty signal |
| REM-6A01 | Relay, central locking. Signal too high |
| REM-6A03 | Relay, central locking. Signal too low |
| REM-6A04 | Unlocking relay, central locking rear left door. Signal too high |
| REM-6A04 | Unlocking relay. Rear left door central locking. Signal too high. Intermittent fault |
| REM-6A05 | Unlocking relay, central locking, rear left door. Signal missing |
| REM-6A06 | Relay, deadlock. Signal too high |
| REM-6A08 | Relay, deadlock. Signal missing |
| REM-6A0B | Locking relay. Rear right door central locking. Signal missing/too low. Intermittent fault |
| REM-6A0C | Unlocking relay, central locking rear right door. Signal too high |
| REM-6A0E | Unlocking relay, central locking rear right door. Signal missing |
| REM-6C11 | Level sensor, power supply. Signal too high. Intermittent fault |
| REM-6C11 | Level sensor, power supply. Signal too high. Permanent fault |
| REM-6C12 | Level sensor, voltage supply. Signal too low. Intermittent fault |
| REM-6C12 | Level sensor, voltage supply. Signal too low. Permanent fault |
| REM-6C15 | Communication with level sensor. Signal missing. Intermittent fault |
| REM-6C15 | Communication with level sensor. Signal missing. Permanent fault |
| REM-6C16 | Level sensor. Internal fault. Intermittent fault |
| REM-6C16 | Level sensor. Internal fault. Permanent fault |
| REM-6F11 | Head rest relay Signal too high. Permanent fault |
| REM-6F11 | Head restraint relay. Signal too high. Intermittent fault |
| REM-6F13 | Head restraint relay. Signal missing. Intermittent fault |
| REM-6F13 | Head restraint relay. Signal missing. Permanent fault |
| REM-6F51 | Boot lid handle. Signal too low. Intermittent fault |
| REM-6F51 | Boot lid handle. Signal too low. Permanent fault |
| REM-6F52 | Unlocking relay, central locking tailgate. Signal too high |
| REM-6F54 | Unlocking relay, central locking tailgate. Signal missing |
| REM-6F71 | Unlocking relay, central locking, fuel tank filler cover. Signal too high |
| REM-6F73 | Unlocking relay, central locking, fuel tank filler cover. Signal missing |
| REM-8C21 | Rear fog lamp relay. Signal too high. Intermittent fault |
| REM-8C21 | Rear fog lamp relay. Signal too high. Permanent fault |
| REM-8C23 | Rear fog lamp relay. Signal missing. Intermittent fault |
| REM-8C23 | Rear fog lamp relay. Signal missing. Permanent fault |
| REM-8D12 | Stop lamp. Signal too low |
| REM-8D13 | Stop lamp. Signal too high / Signal missing |
| REM-8E11 | Reversing light relay. Signal too high. Intermittent fault |
| REM-8E11 | Reversing light relay. Signal too high. Permanent fault |
| REM-8E13 | Reversing light relay. Signal missing. Intermittent fault |
| REM-8E13 | Reversing light relay. Signal missing. Permanent fault |
| REM-8F10 | Position sensor xenon lamp. Signal too high |
| REM-8F11 | Xenon lamp position sensor. Signal too low |
| REM-8F12 | Xenon lamp position sensor. Faulty signal |
| REM-8F13 | Bi-Xenon lamp position sensor. Calibration fault |
| REM-8F61 | Rear window defroster relay. Signal too high. Intermittent fault |
| REM-8F61 | Rear window defroster relay. Signal too high. Permanent fault |
| REM-8F63 | Rear window defroster relay. Signal missing. Intermittent fault |
| REM-8F63 | Rear window defroster relay. Signal missing. Permanent fault |
| REM-9F21 | Luggage compartment lighting Faulty signal. Intermittent fault |
| REM-9F21 | Luggage compartment lighting Faulty signal. Permanent fault |
| REM-E001 | Control module communication. Faulty communication |
| REM-E003 | Configuration fault. Faulty configuration |
| REM-XXXX | Unknown diagnostic trouble code (DTC) for the current control module version |
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:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
