Battery Voltage Too High

This code means your vehicle's computer is detecting that the battery voltage is too high, typically above 16 volts, which can lead to damaging electronics.

The PCM (Powertrain Control Module) is monitoring the battery voltage through the voltage sensor. If it sees a voltage reading above 16 volts for more than 10 seconds, it triggers this code.

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.

1. 11. Check the battery voltage using a multimeter. It should read between 12.0 to 14.5 volts when the engine is running. If it exceeds 16 volts, proceed to step 2. Decision: If voltage is normal, code is likely a false reading. If high, continue.
2. 22. Inspect the alternator for proper operation. Start the engine and check the output voltage. It should not exceed 14.5 volts. Decision: If it's over 14.5, the alternator may be faulty. If it's within range, check wiring.
3. 33. Check the battery voltage regulator if applicable. Make sure it's regulating correctly around 14.0 - 14.5 volts. Decision: If defective, replace the voltage regulator. If it seems fine, check wiring connectivity and integrity.
4. 44. Inspect battery terminals and connections for corrosion or looseness. Clean and tighten as necessary. Decision: If connections are good and clean, suspect wiring issues.

• Faulty voltage regulator
• Failed alternator
• Weak battery
• Corroded battery connections
• Wiring short to battery positive

$100-$600