AutoCodes – GMC – P037B 2016 GMC Sierra

P037B 2016 GMC Sierra Code - Wait To Start Indicator Control Circuit High Voltage

Quick Answer

Ignition voltage is supplied directly to the Wait To Start indicator. Common causes include Faulty Instrument Cluster, Instrument Cluster harness is open or shorted, Instrument Cluster 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: P037B 2016 GMC Sierra indicates Wait To Start Indicator Control Circuit High Voltage.
Common causes: Common causes include Faulty Instrument Cluster, Instrument Cluster harness is open or shorted, Instrument Cluster 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 225

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 17, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P037B 2016 GMC Sierra Description

Ignition voltage is supplied directly to the Wait To Start indicator. The Engine Control Module (ECM) controls the lamp by grounding the control circuit via an internal switch called a driver. The primary function of the driver is to supply the ground for the component being controlled. Each driver has a fault line which is monitored by the ECM. When the ECM is commanding a component ON, the voltage of the control circuit should be low, near zero volts. When the ECM is commanding the control circuit to a component OFF, the voltage potential of the circuit should be high, near battery voltage. The Diagnostic Trouble Code (DTC) will be set when the ECM detects a short to voltage on the Wait To Start Indicator Control circuit for greater than 1 s.

OBDII Code P037B 2016 GMC Sierra - Wait To Start Indicator Control Circuit High Voltage - AutoCodes.com — P037B 2016 GMC Sierra Code - Wait To Start Indicator Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P037B 2016 GMC Sierra?

Faulty Instrument Cluster
Instrument Cluster harness is open or shorted
Instrument Cluster circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P037B 2016 GMC Sierra?

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 P037B 2016 GMC Sierra 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 P037B 2016 GMC Sierra code?

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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 P037B 2016 GMC Sierra Code

What does the OBDII code P037B mean on a 2016 GMC Sierra?

The P037B code indicates a high-voltage issue in the Wait to Start Indicator Control Circuit, which is related to the glow plug system in diesel engines.

What are the common symptoms of the P037B code in a 2016 GMC Sierra?

Symptoms include the Wait to Start indicator not functioning properly, extended engine cranking, rough cold starts, or the check engine light turning on.

What causes the P037B code to appear on a 2016 GMC Sierra?

Common causes include a faulty Wait to Start indicator bulb, damaged wiring or connectors in the circuit, or a malfunctioning glow plug control module.

Can I drive my 2016 GMC Sierra with the P037B code?

While the vehicle may still be drivable, ignoring this code can result in hard starting or damage to the glow plug system, especially in cold weather.

How do I diagnose the P037B code on my 2016 GMC Sierra?

Diagnosis involves checking the Wait to Start indicator bulb, inspecting the circuit wiring and connectors for damage, and testing the glow plug control module for proper operation.

What tools are needed to diagnose the P037B code?

You'll need an OBDII scanner, a multimeter to check circuit voltage, and potentially a wiring diagram for the Wait to Start system.

How do I fix the P037B code on my 2016 GMC Sierra?

Repairs may include replacing the Wait to Start indicator bulb, repairing or replacing damaged wiring, or replacing a faulty glow plug control module.

What can happen if the P037B code is not addressed?

If not addressed, the engine may suffer from starting issues in cold conditions, and the glow plug system could experience further damage.

Is the P037B code specific to diesel engines?

Yes, this code is specific to diesel engines, as it relates to the Wait to Start indicator and glow plug system.

Can a dead battery cause the P037B code?

A weak or dead battery can contribute to electrical issues, but it is not a direct cause of the P037B code. However, verifying proper battery voltage is recommended when diagnosing electrical problems.