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Engine Oil Level Switch

  1. If DTC 72 is present, diagnose trouble code first. Ensure oil level is up to full mark on dipstick. Install Tech 1 scan tester. Turn ignition on, with engine off. If scan tester indicates LOW, go to step 3). If scan tester does not indicate LOW, go to next step.
  2. Disconnect engine oil level switch connector. If scan tester still indicates LOW, replace engine oil level switch. If scan tester does not indicate LOW, check engine oil level switch circuit for short to ground. If circuit is okay, check for faulty PCM. See Figure .
  3. Disconnect engine oil level switch harness connector. Using a test light connected to ground, probe engine oil level harness connector Brown wire terminal. See Figure . If test light does not illuminate, go to next step. If test light illuminates, check for short in Brown wire to PCM. If circuit is okay, check for faulty PCM.
  4. With test light still connected between ground and engine oil level switch harness connector Brown wire terminal, check scan tester display. If scan tester indicates OK, go to next step. If scan tester does not indicate OK, check for open in Brown wire to PCM. If circuit is okay, check PCM connection or for faulty PCM.
  5. Connect test light to battery voltage. Probe test light to engine oil level switch ground terminal (Black wire). If test light illuminates, replace faulty engine oil level switch. If test light does not illuminate, check for open in Black wire to ground.
NOTE: Ensure ignition is off for at least 10 minutes before proceeding with test.


  1. Turn ignition on, with engine off. If "Low Oil Level" light turns on, go to next step. If "Low Oil Level" light does not turn on, connect test light between battery voltage and PCM connector terminal BC7 (Brown/White wire). If test light illuminates, check for blown fuse, open in Brown/White or Dark Green wire to PCM, or faulty indicator bulb. If test light does not illuminate, check Brown/White wire for short to battery voltage. See Figure . If circuit is okay, replace PCM.
  2. Check engine oil level. If oil level is okay, go to next step. If engine oil level is not okay, check level again using Tech 1 scan tester. If scan tester indicates LOW, fill crankcase and repeat step 1). If scan tester does not indicate LOW, disconnect engine oil level switch connector. If scan tester still indicates LOW, replace engine oil level switch. If scan tester does not indicate LOW, check Brown wire between PCM and engine oil level switch for short to ground. If circuit is okay, check for faulty PCM connection or faulty PCM.
  3. Start engine. If "Low Oil Level" light turns off, turn ignition off and go to step 5). If "Low Oil Level" light stays on, turn ignition off. Disconnect PCM harness connector. Turn ignition on. Using a test light connected to battery voltage, probe PCM connector Brown/White wire terminal. If test light illuminates, repair short to ground in Brown/White wire. If test light does not illuminate, go to next step.
  4. Backprobe PCM connector Brown wire terminal. If test light illuminates, replace PCM. If test light does not illuminate, check for open or shorted Brown wire between PCM and engine oil level switch, or open in Black wire from engine oil level switch. If circuits are okay, replace oil level switch.
  5. Turn ignition on, with engine off. Disconnect engine oil level switch harness connector. If scan tester now indicates oil level as LOW, system is okay. If scan tester does not indicate LOW, check for short to ground in Brown wire between PCM and oil level switch. If circuit is okay, replace PCM.
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