P2052: Reductant Injection Valve Circuit High (Bank 2 Unit 1)

P2052 tells that battery potential is present on the switched line of the first Bank 2 injector, for example through a short to a powered wire or moisture bridging connector pins. It belongs to twin-bank SCR layouts in which each cylinder bank owns an injector; publicly, no manufacturer documents this code or its thresholds. For the matching Bank 1 code P2049, GM's 2014 Cruze diesel uses Type B (two trips) and the Deutz EMR5 list describes voltage above normal or a short to the high source, so P2052 would presumably follow the same logic. A driver that sees a short to positive normally switches off to protect itself, leaving the second branch without DEF. CARB's comprehensive-component rules apply; check plug, harness and coil resistance first.

Bank 2 is the side without cylinder 1, so it only exists on V or boxer engines.

Symptoms

• MIL on, possibly after two trips
• No DEF on Bank 2
• Higher tailpipe NOx

Most likely causes

• Control line of the Bank 2 injector touching a supply wire
• Moisture bridging pins in the Bank 2 injector plug
• Faulty output stage for the Bank 2 valve

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the AdBlue/DEF level and quality, and do not add additives or water
2. Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
3. Look for white crystals around the injector and the tank
4. Check connectors and heaters with the scanner
5. Run the dosing test available on your diagnostic tool
6. Replace parts only when the test points to that component

Good to know

• Repair difficulty: medium
• It can trigger limp mode.
• It affects emissions.

What each character of P2052 means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• 0: Subsystem depends on the code range
• 52: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2052?

Deal with it soon. If the instrument cluster shows a countdown, the car may not restart once it reaches zero.

What causes code P2052?

The most common causes are: control line of the Bank 2 injector touching a supply wire; moisture bridging pins in the Bank 2 injector plug; faulty output stage for the Bank 2 valve.

Related codes

• P2050Reductant Injection Valve Circuit/Open (Bank 2 Unit 1)
• P2051Reductant Injection Valve Circuit Low (Bank 2 Unit 1)
• P2049Reductant Injection Valve Circuit High (Bank 1 Unit 1)
• P2058Reductant Injection Valve Circuit High (Bank 2 Unit 2)

Sources

• law.cornell.edu: 13 CCR 1968.2
• gsi.ext.gm.com: 14OBDG04 Engine Diagnostics
• serdia.deutz.com: DTCList MD1 DE EN

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.