OBD2 Code B1367: Ignition Tach Circuit Malfunction
Code B1367 indicates a fault in the ignition tachometer circuit, which transmits engine RPM signals from the ignition control module or ignition coil to the instrument cluster or powertrain control module (PCM). This fault can be caused by an open circuit, short circuit, or abnormal resistance in the wiring, preventing accurate RPM readings. In Ford vehicles, this circuit is often associated with the instrument cluster or PCM.
1. Commonly Affected Makes
2. Most Common Causes
- Damaged or corroded wiring in the tachometer circuit
- Loose or corroded connector at the instrument cluster
- Faulty ignition control module
- Defective ignition coil with incorrect RPM signal output
- Short to ground or voltage in the tachometer circuit
- Faulty instrument cluster
- Internal PCM failure in RPM signal processing
3. Symptoms You Will Notice
- Inoperative or erratic tachometer
- Check Engine Light or instrument cluster warning light illuminated
4. Step-by-Step Diagnosis
Inspect wiring and connectors in the tachometer circuit for damage, corrosion, or looseness.
Test the ignition control module and ignition coil for proper RPM signal output.
Check for shorts to ground or voltage in the tachometer circuit using a multimeter.
Verify instrument cluster functionality; if necessary, test or replace the cluster.
If all else fails, diagnose the PCM for internal faults.
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, but the tachometer may not work correctly. The vehicle can still be driven, but you won't have accurate RPM readings, which could make it harder to monitor engine performance.
How much does it cost to fix?▼
Repair costs typically range from $100 to $400, depending on the root cause. Simple wiring repairs may cost under $100, while replacing an instrument cluster or PCM can exceed $500.