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Temperature Gauge Is Incorrect

  1. Check that engine does not have an overheating condition. Also check that ECM diagnostic code E014 or E015, or BCM diagnostic code B450 have been set. If no codes have set, proceed to step 6).
  2. If code E014 has been set by ECM, Coolant Temperature Sensor (CTS) circuit may be at fault. With ignition on and engine stopped, clear codes and enter ECM data ED04. Select Metric display using English/Metric (E/M) button.
  3. Check if coolant temperature displayed, is at 266°F (130°C) or above. If temperature displayed is above 266°F (130°C), disconnect CTS.
  4. Coolant temperature should be displayed below -22°F (-30°C). If coolant temperature is displayed below -22°F (-30°C), CTS is faulty.
  5. Check to see if coolant temperature is displayed above -22°F (-30°C). Circuit No. 410 (Yellow wire) should be checked for short to ground. If circuit is okay, ECM is faulty.
  6. Determine actual coolant temperature using coolant temperature testing device. Enter diagnostics, select ECM data input ED04 and note data display.
  7. If ECM data input ED04 and actual coolant temperature are not comparable, replace coolant temperature sensor. If ECM data input ED04 and actual coolant temperature are comparable, replace IPC.
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