U0207 Lost Communication with Roof Control Module
Diagnostic trouble code U0207 indicates a loss of communication between the engine control module (ECM) or body control module (BCM) and the moveable roof control module. This fault is triggered when the transmitting module does not receive the expected acknowledgment signal from the roof module over the vehicle's communication network bus (such as CAN, LIN, or ISO 9141-2). The interruption in serial data transmission prevents the main system from monitoring or commanding the operation of the sunroof or convertible top.
1. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.
2. Most Common Causes
- Faulty moveable roof control module
- Open or shorted wiring between the roof module and the communication bus
- Poor connection or corroded terminals in the roof module connectors
- Voltage drop (defective power supply or ground) to the moveable roof control module
- Faulty body control module (BCM) or network gateway
3. Symptoms You Will Notice
- Sunroof or convertible top inoperative or operates erratically
- Illuminated check engine light or communication-related warning light
4. Step-by-Step Diagnosis
Scan for other communication-related DTCs to identify broader network issues.
Inspect the moveable roof control module connector for corrosion, bent pins, or poor contact.
Check power and ground circuits at the roof module; verify voltage and ground integrity.
Test communication bus wiring (CAN/LIN) for opens, shorts, or high resistance.
If wiring and power are okay, suspect a faulty roof module or BCM/gateway.
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, the vehicle is generally safe to drive, but the sunroof or convertible top may not operate. Have the issue diagnosed soon to prevent further electrical problems.
How much does it cost to fix?▼
Diagnosis typically costs $100-$150. Repair costs vary: a wiring repair may be $150-$300, while replacing the roof control module can range from $400-$800 including labor.