P2054

Reductant Injection Valve Circuit Low Bank 1 Unit 2

Q: Is it safe to drive with P2054?

The engine drives fine, but the SCR system may stop dosing DEF and many diesels begin a derate countdown. Fix it before the vehicle limits power or speed.

Q: Can I just clear P2054?

It returns until the injection valve or wiring is repaired, and clearing won't prevent an emissions derate from recurring.

Emissions (SCR / DEF after-treatment) Generic OBD-II Medium

What it means

P2054 means the second reductant (diesel-exhaust-fluid) injection valve on bank 1 is reporting an abnormally low circuit voltage, so the SCR system can't meter DEF into the exhaust properly. The engine still starts and runs, but NOx emissions rise and many diesels start a derate countdown. It's usually a shorted injector, wiring, or connector fault.

Medium

Can I keep driving? The engine runs and starts normally, but the SCR system can't dose DEF properly and some diesels derate power — repair it promptly.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
SCR / diesel-exhaust-fluid (DEF) system warning
Higher NOx emissions; may fail an emissions test
Speed / power derate if the fault persists (varies by vehicle)

Common causes

Most likely first

Reductant (DEF) injection valve on bank 1 unit 2 shorted or open (reads low)Likely
Injector control wiring shorted to groundCommon
Corroded or loose connector at the injection valveCommon
Failed reductant injection valveLess often
Dosing control module / PCM fault (least likely)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data and check for companion injector codes (P2053, P2055).
Inspect the injection-valve connector and wiring for a short to ground or corrosion.
Measure the injector's resistance against spec; a low reading points to a shorted valve.
Replace the reductant injection valve if faulty, then clear and re-test the SCR system.

FAQ

Quick answers

Is it safe to drive with P2054?+

The engine drives fine, but the SCR system may stop dosing DEF and many diesels begin a derate countdown. Fix it before the vehicle limits power or speed.

Can I just clear P2054?+

It returns until the injection valve or wiring is repaired, and clearing won't prevent an emissions derate from recurring.

Read & clear P2054 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX