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P16AE GMC Code - Glow Plug Control Module Temperature Sensor Circuit High Voltage

Quick Answer

The Glow Plug Control Module (GPCM) has the ability to perform internal diagnostics for the temperature sensor circuit. Common causes include Faulty Glow Plug Control Module (GPCM), Glow Plug Control Module harness is open or shorted, Glow Plug Control Module circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P16AE GMC indicates Glow Plug Control Module Temperature Sensor Circuit High Voltage.
Common causes
Common causes include Faulty Glow Plug Control Module (GPCM), Glow Plug Control Module harness is open or shorted, Glow Plug Control Module circuit poor electrical connection.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code Popularity 1,803
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Oct 01, 2022
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Code P16AE GMC Description

The Glow Plug Control Module (GPCM) has the ability to perform internal diagnostics for the temperature sensor circuit. The GPCM monitors the internal temperature sensor voltage and if the voltage is less than 0.21 V or greater than 4.94 V. The GPCM will send a message to the Engine Control Module (ECM) to set the appropriate Diagnostic Trouble Code (DTC). A DTC is detected when one of the GPCM temperature sensors voltage falls outside the calibrated threshold for greater than 1.3 s.
OBDII Code P16AE GMC - Glow Plug Control Module Temperature Sensor Circuit High Voltage - AutoCodes.com
P16AE GMC Code - Glow Plug Control Module Temperature Sensor Circuit High Voltage
What does this mean?

What are the Possible Causes of the DTC P16AE GMC?

  • Faulty Glow Plug Control Module (GPCM)
  • Glow Plug Control Module harness is open or shorted
  • Glow Plug Control Module circuit poor electrical connection

How to Fix the DTC P16AE GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P16AE GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P16AE GMC code?

Need more information on how to fix the P16AE GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P16AE GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P16AE GMC Code

What does the OBDII code P16AE mean on a GMC vehicle?

1. The P16AE code indicates a high voltage issue in the Glow Plug Control Module Temperature Sensor Circuit, which monitors the temperature of the glow plug system. 2.

What are the common symptoms of the P16AE code on a GMC?

Common symptoms include the check engine light turning on, difficulty starting the engine in cold weather, and reduced engine performance. 3.

What causes the P16AE code to appear on a GMC?

Possible causes include a faulty temperature sensor, damaged wiring or connectors, or an issue with the glow plug control module itself. 4.

Can I drive my GMC with the P16AE code active?

While you might still be able to drive the vehicle, it’s not recommended as it could lead to poor cold starting performance and potential long-term damage to the glow plug system. 5.

How do I diagnose the P16AE code on my GMC?

Diagnosis typically involves checking the wiring and connectors for damage, testing the temperature sensor for proper operation, and using a scan tool to monitor circuit voltages. 6.

How is the P16AE code repaired on a GMC?

Repairs may include replacing the glow plug control module temperature sensor, repairing or replacing damaged wiring and connectors, or reprogramming the control module if necessary. 7.

How much does it cost to fix the P16AE code on a GMC?

Repair costs can range from $100 to $500, depending on whether the issue is related to the sensor, wiring, or the glow plug control module itself. 8.

Can a faulty glow plug cause the P16AE code on a GMC?

No, this code is specifically related to the temperature sensor circuit, not the glow plug itself. However, glow plugs should still be checked as part of the system. 9.

What tools are needed to troubleshoot the P16AE code on a GMC?

You’ll need an OBDII scanner, a multimeter to test voltages and continuity, and possibly a wiring diagram for the glow plug system. 10.

Will clearing the P16AE code fix the problem on a GMC?

Clearing the code will turn off the check engine light temporarily, but unless the underlying issue is resolved, the code will return.

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