P2051 GMC Code - Reductant Injection Valve Circuit Low Bank 2 Unit 1
Quick Answer
The Reductant Dosing Valve (Reductant Injection Valve) is used to meter and atomize the reductant liquid before it is mixed with the exhaust gas. Common causes include Faulty Reductant Injection Valve, Reductant Injection Valve harness is open or shorted, Reductant Injection Valve 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
- P2051 GMC indicates Reductant Injection Valve Circuit Low Bank 2 Unit 1.
- Common causes
- Common causes include Faulty Reductant Injection Valve, Reductant Injection Valve harness is open or shorted, Reductant Injection Valve 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 P2051 GMC Description
What are the Possible Causes of the DTC P2051 GMC?
- Faulty Reductant Injection Valve
- Reductant Injection Valve harness is open or shorted
- Reductant Injection Valve circuit poor electrical connection
How to Fix the DTC P2051 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 P2051 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 P2051 GMC code?
Need more information on how to fix the P2051 GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P2051 GMC code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P2051 GMC Code
What does the OBDII code P2051 mean on a GMC vehicle?
The P2051 code indicates a problem with the reductant injection valve circuit for Bank 2, Unit 1, where the circuit voltage is lower than expected.
What are common symptoms of the P2051 code?
Symptoms include the check engine light turning on, reduced engine performance, poor emissions, and possible activation of limp mode.
What causes the P2051 code to appear?
Common causes include a faulty reductant injection valve, damaged wiring or connectors in the circuit, or a malfunctioning reductant control module.
Can I drive my GMC vehicle with the P2051 code active?
Driving is possible but not recommended, as it may lead to increased emissions, reduced performance, and potential damage to the emission control system.
How do I diagnose the P2051 code on a GMC?
Diagnosis involves inspecting the wiring and connectors for damage, testing the reductant injection valve for proper operation, and checking the control module for faults.
What tools are needed to troubleshoot the P2051 code?
You’ll need an OBDII scanner, a multimeter to test electrical components, and possibly a wiring diagram for the reductant system.
How do I fix the P2051 code on my GMC?
Repairs may include replacing the reductant injection valve, repairing or replacing damaged wiring or connectors, or replacing the reductant control module if faulty.
What is the reductant injection valve?
The reductant injection valve is part of the diesel exhaust fluid (DEF) system that injects DEF into the exhaust to reduce emissions.
How much does it cost to fix the P2051 code?
The repair cost varies depending on the specific issue, ranging from $100 for wiring repairs to $500 or more for a new reductant injection valve or control module.
Can a software update fix the P2051 code?
In some cases, a software update to the reductant control module may resolve the issue if it’s related to programming errors.
Discuss the causes and fixes for P2051 GMC OBDII Code
Code P2051 GMC comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
