P16B3 GMC Code - Engine Controls Ignition Relay Feedback Circuit 2 High Voltage
Quick Answer
There are 3 ignition voltage circuits supplied to the Engine Control Module (ECM). Common causes include Faulty Engine Controls Ignition Relay, Engine Controls Ignition Relay harness is open or shorted, Engine Controls Ignition Relay 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
- P16B3 GMC indicates Engine Controls Ignition Relay Feedback Circuit 2 High Voltage.
- Common causes
- Common causes include Faulty Engine Controls Ignition Relay, Engine Controls Ignition Relay harness is open or shorted, Engine Controls Ignition Relay 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.
Code P16B3 GMC Description
What are the Possible Causes of the DTC P16B3 GMC?
- Faulty Engine Controls Ignition Relay
- Engine Controls Ignition Relay harness is open or shorted
- Engine Controls Ignition Relay circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P16B3 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 P16B3 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.
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Frequently Asked Questions about P16B3 GMC Code
What does the OBDII code P16B3 mean for GMC vehicles?
Code P16B3 indicates a high voltage condition in the Engine Controls Ignition Relay Feedback Circuit 2, which monitors the ignition relay's operation.
What are the common symptoms of code P16B3 in GMC vehicles?
Symptoms may include difficulty starting the engine, intermittent stalling, reduced engine power, or the illumination of the check engine light.
What causes code P16B3 in GMC vehicles?
Common causes include a faulty ignition relay, damaged wiring or connectors in the ignition circuit, or a malfunctioning ECM (Engine Control Module).
How do I diagnose code P16B3 in my GMC vehicle?
Diagnosis typically involves inspecting the ignition relay, wiring, and connectors for damage, testing the relay for proper function, and using a multimeter to check circuit voltages.
Can I still drive my GMC vehicle with code P16B3?
While the vehicle may still be drivable, continuing to drive with this code may cause further damage or lead to unexpected stalling. It's best to address the issue promptly.
How can I fix code P16B3 in my GMC vehicle?
Repairs may involve replacing the ignition relay, repairing damaged wiring or connectors, or reprogramming or replacing the ECM if necessary.
How much does it cost to repair code P16B3 in GMC vehicles?
Repair costs vary depending on the issue but can range from $50 for a new relay to several hundred dollars if ECM replacement or reprogramming is required.
Can a faulty ignition relay cause other problems besides code P16B3?
Yes, a faulty ignition relay can cause issues such as intermittent power loss, engine stalling, or failure to start the vehicle.
What tools are required to diagnose and fix code P16B3?
Common tools include a diagnostic scanner, a multimeter for voltage testing, and basic hand tools for replacing components or repairing wiring.
Is code P16B3 specific to GMC vehicles?
Code P16B3 is most commonly associated with GMC vehicles, but it may appear on other General Motors models with similar ignition relay systems.
Discuss the causes and fixes for P16B3 GMC OBDII Code
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