What Does P2055 Mean?
The PCM detects abnormally high voltage or resistance in the reductant injection valve circuit for Bank 1, Unit 2. This indicates excessive resistance in the circuit, typically from poor connections or high-resistance faults.
Common Causes
35%
Corroded or loose electrical connector at injection valve
30%
High resistance in wiring harness due to corrosion or partial break
20%
Faulty reductant injection valve with high internal resistance
10%
Poor ground connection at injection valve or control module
5%
Failed DEF control module driver circuit with high resistance
Diagnostic Steps
1
Step 1: Inspect and clean all connectors in the reductant injection valve circuit
2
Step 2: Measure injection valve coil resistance and compare to specification (typically 2-10 ohms)
3
Step 3: Perform voltage drop test on both power and ground circuits while commanding valve on
4
Step 4: Check all ground connections for corrosion and proper torque
5
Step 5: Replace injection valve if resistance is high or repair wiring/connections as needed
Estimated Repair Cost
$200 - $1,200
Parts + labor, varies by vehicle and location
The PCM detects abnormally high voltage or resistance in the reductant injection valve circuit for Bank 1, Unit 2. This indicates excessive resistance in the circuit, typically from poor connections or high-resistance faults.
The most common cause of P2055 (Reductant Injection Valve Circuit High Bank 1 Unit 2) is: Corroded or loose electrical connector at injection valve
Typical repair costs for P2055 range from $200 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive short term but will cause emissions non-compliance. Extended driving may trigger progressive power reduction and eventually prevent vehicle restart.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2055 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System (SCR/DEF)
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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