P0648 Code - Immobilizer Lamp Control Circuit

What Does P0648 Mean?

A P0648 trouble code means that the PCM or other control module has detected an abnormal reading in the immobilizer lamp control circuit. Vehicle owners should keep in mind that illumination of the Check Engine light might require multiple drive cycles, sometimes even up to eight.

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What are the common causes of P0648 ?

• Faulty Immobilizer Lamp
• Immobilizer Lamp harness is open or shorted
• Immobilizer Lamp circuit poor electrical connection

How do you troubleshoot P0648 ?

Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors. If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition.

Searches related to P0648 Code - Immobilizer Lamp Control Circuit

• P0648
• P0649