Left Rear Lamp Circuit Short to Power
A short circuit is detected in the left rear lamp circuit.
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What it means (plain English)
The left rear light isn't working properly because there's a short somewhere in the wiring that causes too much power to flow.
What the computer is actually seeing
The vehicle’s computer monitors the voltage in the left rear lamp circuit. When the voltage exceeds the expected level (usually around 12V), it triggers the code.
What a healthy reading looks like
Normal operation shows 0V when the lamp is off and close to battery voltage (12V or higher) when the lamp is on.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the left rear lamp assembly for any signs of damage or corrosion. If damaged, replace the assembly and retest.
- 22. Check the wiring harness for the left rear lamp for any visible shorts, frays, or pinches. Repair as needed and retest.
- 33. Using a multimeter, measure the voltage at the left rear lamp connector while the lamp is on. It should read close to 12V. If it reads excessively high, further inspect the circuit for short.
- 44. If all looks good, check the vehicle’s wiring diagram for the left rear lamp circuit to trace back and test individual connections for continuity. Fix any breaks found.
Common causes
- Wiring shorting to ground or power
- Corroded connectors
- Faulty rear lamp assembly
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; the left rear lamp may not work, which can be a safety hazard, especially at night.
Will this code come back after I clear it?
If the underlying issue isn't fixed, it will likely return after the vehicle is driven for a bit.
Why would this code appear with another code?
Sometimes multiple codes can trigger if they're related to the same circuit or system, like multiple lights in the rear.
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