P2055 — Reductant Injection Valve Circuit High Bank 1 Unit 2

powertrain (engine/transmission)

Is it safe to drive?

Short-term driving is OK In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

How to diagnose with an OBD scanner

  1. Read the code and freeze frame Connect an OBD2 scanner, confirm P2055 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
  3. Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the reductant injection valve circuit high bank 1 unit 2 for damage, corrosion, chafing or poor contact.
  4. Subsystem check Measure reference voltage, ground and signal continuity at the component connector.
  5. Subsystem check Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
  6. Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2055 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P2055 (parts and labor, USD, independent shop rates): Control module repair: $300–$1,000; Repair wiring or connectors: $80–$250; Replace the faulty sensor or actuator: $150–$500. Overall, fixing P2055 usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

What are the symptoms of P2055?

Drivers most often notice: increased fuel consumption in some cases, possible limp mode depending on the affected component, the affected system operates intermittently or not at all, Check Engine Light on.

How do I diagnose P2055 myself?

Start with a scan: confirm P2055, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the sensor and actuator circuits, and verify the suspect component against live data before buying parts.

Is it safe to drive with P2055?

In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

What is the most common cause of P2055?

The most common causes are: blown fuse feeding the circuit, open or shorted wiring in the circuit, control module driver fault.

How much does it cost to fix P2055?

Control module repair — $300–$1,000; Repair wiring or connectors — $80–$250; Replace the faulty sensor or actuator — $150–$500. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

What does P2055 mean?

When P2055 appears on a scan, it means the control module has flagged a problem in the sensor and actuator circuits: reductant injection valve circuit high bank 1 unit 2. The fault sits in the powertrain (engine/transmission) group of the OBD2 standard.

“Bank 1” means the side of the engine that contains cylinder 1. Verify which side that is on your specific engine before testing or replacing parts.

This code does not appear from a single bad reading: the module must see the fault condition repeat under defined operating conditions before it turns on the warning light. The freeze frame captured with P2055 — engine load, rpm, temperature, speed — tells you exactly when the problem occurs, so reproduce those conditions when testing.

What causes P2055?

  • faulty sensor or actuator of the affected circuit
  • poor ground connection
  • blown fuse feeding the circuit
  • control module driver fault
  • open or shorted wiring in the circuit

Common symptoms of P2055

  • increased fuel consumption in some cases
  • possible limp mode depending on the affected component
  • the affected system operates intermittently or not at all
  • Check Engine Light on

How to diagnose P2055

  1. Connect an OBD2 scanner, confirm P2055 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
  3. Visually inspect the wiring harness and connectors related to the reductant injection valve circuit high bank 1 unit 2 for damage, corrosion, chafing or poor contact.
  4. Measure reference voltage, ground and signal continuity at the component connector.
  5. Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
  6. Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2055 does not return.

How to fix P2055

Start with the cheapest and most common causes before replacing expensive parts:

  • Control module repair — $300–$1,000
  • Repair wiring or connectors — $80–$250
  • Replace the faulty sensor or actuator — $150–$500

How much does it cost to fix P2055?

Repair cost depends on which component actually failed. Typical scenarios for P2055 (parts and labor, USD, independent shop rates):

  • Control module repair: $300–$1,000
  • Repair wiring or connectors: $80–$250
  • Replace the faulty sensor or actuator: $150–$500

Overall, fixing P2055 usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Can you drive with P2055?

In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

Related OBD2 codes