B1351
Moderate Severity (Level 3)Ignition Key-In Circuit Short To Battery
B1351 usually means ignition Key-In Circuit Short To Battery.
Can you still drive with B1351?
⚠️Short-distance driving is usually OK, but have this diagnosed within a week to prevent further damage.
Typical repair cost: $120 – $1000
Severity Level 3 — Moderate
This code indicates a moderate issue that may affect vehicle performance and fuel economy. Continued driving is possible in most cases, but prompt diagnosis and repair are recommended to prevent further damage.
Common Symptoms
- Security light flashing — vehicle may not start
- Battery draining overnight or when vehicle is parked
- Alarm going off randomly or not arming
- Excessive current draw on the key/immobilizer system circuit (fuse may blow repeatedly)
Possible Causes
- Damaged wiring in the key/immobilizer system harness shorted to a 12V power source — wiring insulation chafed through from rubbing against metal body panels
- Water intrusion or corrosion in key/immobilizer system electrical connector causing internal short to battery voltage
- Failed immobilizer antenna — internal short to power within the component
- Aftermarket accessory installation tapped into the wrong circuit, back-feeding 12V
Common Fixes
- Scan vehicle with a professional-grade OBD2 scanner to read all stored codes and freeze frame data — note the conditions when the code set ($26-137 at shop, free at auto parts store for basic scan)
- Visually inspect the key/immobilizer system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $127 diagnostic fee at shop)
- Repair or replace damaged section of wiring harness where short is located — solder and heat-shrink all connections, don't use crimp connectors on critical circuits ($187-260 depending on accessibility)
- If immobilizer antenna is internally shorted, replace with a quality OEM or OEM-equivalent aftermarket unit ($100-800)
- Clean all ground points related to the key/immobilizer system — remove bolt, sand contact surface to bare metal, apply dielectric grease, and torque to spec ($56-172 at shop)
Estimated Repair Cost
These are estimated costs based on generic repair data. Actual costs may vary depending on your vehicle, location, and labor rates.
Frequently Asked Questions
What does B1351 mean?
B1351 stands for "Ignition Key-In Circuit Short To Battery". B1351 usually means ignition Key-In Circuit Short To Battery.
Can you drive with B1351?
Short-distance driving is usually OK, but have this diagnosed within a week to prevent further damage.
How much does it cost to fix B1351?
Repair costs for B1351 typically range from $120 to $1000, depending on your vehicle make, model, and local labor rates. Common fixes include: Scan vehicle with a professional-grade OBD2 scanner to read all stored codes and freeze frame data — note the conditions when the code set ($26-137 at shop, free at auto parts store for basic scan); Visually inspect the key/immobilizer system wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $127 diagnostic fee at shop); Repair or replace damaged section of wiring harness where short is located — solder and heat-shrink all connections, don't use crimp connectors on critical circuits ($187-260 depending on accessibility).
Will B1351 clear itself?
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