P245D: EGR Cooler Bypass Control Circuit High (Bank 1)

P245D is the short-to-supply case of the bank 1 bypass circuit. For the Duramax with a DC-motor bypass, GM's 2017 tables watch the current through the H-bridge while it drives the flap: more than 8 A in 160 of 200 samples sets a Type B fault. On the vacuum-switched version the check looks at resistance to the supply side, and the 2014 tables describe high voltage while the driver is on. Ram issued a PCM software update in 2025 for 2024 heavy-duty pickups with the 6.7 L Cummins that set P245D, together with other air handling codes, to remove false actuator faults, so the software level should be checked before the harness is opened. In a genuine case a wire touching a battery feed or an actuator with a low-resistance winding is found. Open circuit is P245A, short to ground P245C, bank 2 is P2491.

Bank 1 is the side of the engine with cylinder 1. Inline engines only have this bank.

Symptoms

• Malfunction indicator lamp on
• Bypass actuator switched off by the controller and left in default position

Most likely causes

• Control software reporting a false actuator fault (known on some Ram diesels)
• Control wire shorted to a battery or ignition feed
• Actuator motor drawing excessive current (low-resistance winding, binding)

What to check, in order

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

1. Check the connector and any vacuum hoses
2. Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
3. Use live data to compare the commanded opening with the actual opening
4. Clean the valve and passages if they are clogged with carbon
5. Test the actuator with the scanner
6. Replace the valve if it still does not follow the command after cleaning

Good to know

• Repair difficulty: medium
• It affects emissions.

What each character of P245D means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• 4: Emissions
• 5D: Specific fault in that system

Frequently asked questions

Can I keep driving with code P245D?

You can normally drive in moderation, but get it repaired soon: if the valve is stuck open, the engine may idle very poorly.

What causes code P245D?

The most common causes are: control software reporting a false actuator fault (known on some Ram diesels); control wire shorted to a battery or ignition feed; actuator motor drawing excessive current (low-resistance winding, binding).

Related codes

• P245AEGR Cooler Bypass Control Circuit/Open (Bank 1)
• P245BEGR Cooler Bypass Control Circuit Range/Performance (Bank 1)
• P245CEGR Cooler Bypass Control Circuit Low (Bank 1)
• P2491EGR Cooler Bypass Control Circuit High (Bank 2)
• P2457EGR Cooler A Efficiency Below Threshold

Sources

• gsi.ext.gm.com: 17OBDG04 Engine Diagnostics
• static.nhtsa.gov: MC 11013019 0001
• gsi.ext.gm.com: 14OBDG04 Engine Diagnostics

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.