B1845
Ignition Tamper Circuit Failure
B1845 is an OBD-II diagnostic trouble code meaning: Ignition Tamper Circuit Failure. Common causes: faulty ignition switch, damaged key or key chip. Estimated repair cost: $56–222.
Symptoms
- Engine won't start
- The immobilizer indicator is flashing
- The engine stalls immediately after starting
- Loss of power to the ignition system
Causes
- Faulty ignition switch
- Damaged key or key chip
- Open or short circuit in wiring harness
- Corrosion of contacts in the ignition circuit
- Faulty immobilizer module
- Problems with the safety switch module
How to Fix
- Diagnostics of the ignition circuit with a multimeter
- Checking the status of the ignition key and its chip
- Inspect the wiring harness for damage
- Checking the contacts in the ignition switch
- Testing the immobilizer module
- Replacing faulty components
Related codes
FAQ
What does the B1845 code mean?
B1845 is an OBD-II diagnostic trouble code that indicates: Ignition Tamper Circuit Failure
What causes a B1845 error code?
The most common causes of B1845 include: Faulty ignition switch; Damaged key or key chip; Open or short circuit in wiring harness; Corrosion of contacts in the ignition circuit.
How do I fix a B1845 diagnostic trouble code?
To fix B1845: Diagnostics of the ignition circuit with a multimeter. Checking the status of the ignition key and its chip. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B1845?
Yes, but get it checked soon
How much does it cost to fix B1845?
The estimated repair cost for B1845 is $56–222. Actual cost depends on your vehicle, location, and labor rates.
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