P166A
Restraints Deployment Communication Circuit
P166A is an OBD-II diagnostic trouble code meaning: Restraints Deployment Communication Circuit. Common causes: open or short circuit in the communication circuit, poor contact in security system connectors. Estimated repair cost: $17–111.
Symptoms
- Airbag light is on
- The safety system may not work in an accident
- The error may appear after repairs or an accident.
- Possible problems with other security systems
Causes
- Open or short circuit in the communication circuit
- Poor contact in security system connectors
- Airbag module malfunction
- Damage to the wiring harness after an accident
- Airbag module power supply problems
How to Fix
- Check the continuity of the communication circuit using a multimeter
- Inspect connectors and contacts for oxidation or damage
- Check the power and ground of the airbag module
- If necessary, replace damaged wires or connectors
- Repair only from an authorized dealer
Related codes
FAQ
What does the P166A code mean?
P166A is an OBD-II diagnostic trouble code that indicates: Restraints Deployment Communication Circuit
What causes a P166A error code?
The most common causes of P166A include: Open or short circuit in the communication circuit; Poor contact in security system connectors; Airbag module malfunction; Damage to the wiring harness after an accident.
How do I fix a P166A diagnostic trouble code?
To fix P166A: Check the continuity of the communication circuit using a multimeter. Inspect connectors and contacts for oxidation or damage. Check the power and ground of the airbag module. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P166A?
Do not drive — repair immediately
How much does it cost to fix P166A?
The estimated repair cost for P166A is $17–111. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat