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P1672

Low Engine Oil Level Lamp Control Circuit.

  • Oldsmobile
  • Powertrain
  • Manufacturer code
  • Low severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
6
AreaComputer and output circuits
72
FaultThe specific fault in that area

What it means

P1672 on an Oldsmobile means the powertrain control module has detected a fault in the control circuit for the low engine oil level warning lamp. The module drives the lamp and monitors the circuit, and it set the code because the voltage or state it saw did not match what it commanded. This points to a fault in the lamp circuit, not necessarily to a genuinely low oil level.

Symptoms

  • Low oil level warning lamp stays on, or never lights during the bulb check
  • Lamp flickers or comes on intermittently
  • Check engine lamp or service engine lamp illuminated
  • Oil level message or lamp not matching the actual dipstick reading
  • No other obvious driveability problems

Possible causes

  • Open circuit, short to ground or short to voltage in the lamp control wiringlikely
  • Corroded, loose or damaged connector at the PCM, instrument cluster or oil level sensorlikely
  • Faulty oil level sensor or switch, where fitted on the modelpossible
  • Blown bulb or failed lamp driver in the instrument clusterpossible
  • Genuinely low engine oil level triggering the lamp circuit faultpossible
  • Internal PCM driver faultrare

How to diagnose

  1. Check the engine oil level on the dipstick with the car on level ground and top up if it is low
  2. Read the stored codes and freeze frame data, then note whether the code is current or history
  3. Watch the lamp during the key-on bulb check to see if it lights, stays on or stays off
  4. Inspect the wiring and connectors at the oil level sensor, instrument cluster and PCM for damage, chafing, water ingress or corrosion
  5. Check the lamp circuit for a supply voltage, continuity and shorts to ground or voltage using the wiring diagram for the specific model and engine
  6. Test the oil level sensor or switch against the manufacturer specification, where one is fitted
  7. Check the bulb and the cluster lamp driver operation
  8. Clear the code and road test to see if it returns

How to fix

  • Top up or correct the engine oil level and investigate any oil loss
  • Repair or replace damaged wiring and clean or replace faulty connectors
  • Replace the faulty oil level sensor or switch
  • Replace the blown bulb or repair the instrument cluster lamp driver
  • Repair or replace the PCM only after wiring, sensor and cluster faults have been ruled out

Can I keep driving?

Low severity

The car can normally be driven while you book it in, but check the oil level by hand first and regularly, because the warning lamp may not be reliable. If the oil really is low, top it up before driving any further.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.

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