B1681
PATS Transceiver Module Signal Is Not Received
B1681 is an OBD-II diagnostic trouble code meaning: PATS Transceiver Module Signal Is Not Received. Common causes: transponder fault in the key, open or short in pats module wiring harness. Estimated repair cost: $56–167.
Symptoms
- Engine won't start
- The immobilizer indicator is on
- Car stalls after starting
- Starting is only possible in emergency mode
Causes
- Transponder fault in the key
- Open or short in PATS module wiring harness
- Damage to the transponder antenna (ring around the ignition switch)
- PATS module malfunction
- Problems with module power or grounding
How to Fix
- Check the condition of the ignition key (physical damage, battery charge for remote control keys)
- Diagnose the PATS module wiring harness for opens and shorts
- Check the transponder antenna around the ignition switch
- Read PATS module fault codes using a scanner
- If necessary, replace the PATS module or transponder
Related codes
FAQ
What does the B1681 code mean?
B1681 is an OBD-II diagnostic trouble code that indicates: PATS Transceiver Module Signal Is Not Received
What causes a B1681 error code?
The most common causes of B1681 include: Transponder fault in the key; Open or short in PATS module wiring harness; Damage to the transponder antenna (ring around the ignition switch); PATS module malfunction.
How do I fix a B1681 diagnostic trouble code?
To fix B1681: Check the condition of the ignition key (physical damage, battery charge for remote control keys). Diagnose the PATS module wiring harness for opens and shorts. Check the transponder antenna around the ignition switch. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B1681?
Yes, but get it checked soon
How much does it cost to fix B1681?
The estimated repair cost for B1681 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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