RCM Internal Memory Erase Circuit Failure
Diagnostic trouble code B1917 indicates that the Restraints Control Module (RCM) has detected a fault in its internal circuit responsible for clearing deployment or crash data. This circuit is essential for resetting the system after a collision event or allowing module reprogramming. Activation of this code typically points to an internal hardware failure of the RCM or corruption of its non-volatile memory, preventing the airbag system from functioning correctly and keeping the warning light illuminated.
1. Commonly Affected Makes
2. Most Common Causes
- Internal failure of the Restraints Control Module (RCM)
- Corruption of the RCM's non-volatile memory (EEPROM)
- Attempt to clear memory with insufficient battery voltage
- Damage to the RCM power or ground wiring interrupting the erase process
- Corrupt or incompatible RCM software/calibration
3. Symptoms You Will Notice
- Airbag warning light illuminated on the dashboard
- Airbag system may be disabled or inoperative
4. Step-by-Step Diagnosis
Verify battery voltage is at least 12.6 volts before any memory clearing attempts.
Inspect RCM power and ground circuits for damage, corrosion, or loose connections.
Attempt to clear the code with a professional scan tool; if it returns, suspect internal RCM failure.
Check for any technical service bulletins (TSBs) related to RCM software updates or known issues.
If all else fails, replace the RCM and perform necessary programming/calibration.
5. Frequently Asked Questions
Is it safe to drive?▼
No, it is not safe to drive. The airbag system may be disabled, increasing the risk of injury in a collision. Have the vehicle towed to a repair facility.
How much does it cost to fix?▼
Repair costs typically range from $500 to $1,500, depending on the need for RCM replacement and programming labor.