OBD-II Code P2149 — What It Means & How to Fix It

What Does This Error Mean?

P2149 means the fuel injector Group B supply voltage circuit is open. Vehicles use grouped injector power circuits — Group A feeds one set of injectors, Group B feeds another. When the PCM detects an open circuit (no voltage) in the Group B supply, it sets P2149. The affected cylinders will not fire, causing multiple misfires, rough running, or a no-start condition. This is a serious code — multiple cylinders can be dead if Group B power is lost.

Affected Models

Common in Dodge Ram, Durango, and Dakota
Common in Jeep Grand Cherokee and Commander
Common in Chrysler 300 and Dodge Charger with V8
Seen in some GM and Ford V8 and V6 models with grouped injector circuits

Common Causes

Blown fuse in the fuel injector power supply circuit for Group B
Faulty PCM driver output for the injector Group B supply voltage
Open or broken wire in the injector power supply harness — common from heat and vibration near the engine
Damaged injector wiring connector or corroded injector harness connector causing open circuit
Failed injector driver module (if equipped separately from the PCM)

How to Fix It

Check all fuel injector-related fuses in both the under-hood and interior fuse panels.

A blown injector fuse is the most common and least expensive cause of P2149.
Locate the injector wiring harness on the engine and inspect for visible damage — burned, chafed, or melted insulation.

The injector harness runs along the top of the engine near hot surfaces and is vulnerable to heat damage over time.
Identify which cylinders belong to Group B on your specific engine and verify that none of those injectors are firing.

You can confirm dead injectors using a noid light — plug it into the injector connector. A non-flashing light confirms no signal.
Trace the Group B injector supply wire from the fuse box to the injectors and check for continuity.

An open (infinite resistance) reading confirms a broken wire in the supply circuit.
Repair broken wiring or replace the injector wiring harness if multiple damage points are found.

If the wiring is intact and fuses are good, have the PCM tested — a failed output driver may be the cause.

When to Call a Professional

Fuse replacement is under $5 and is the first thing to check. Wiring repair cost varies — $100 to $400 depending on harness access. PCM replacement is $200 to $600 for Chrysler products. Multiple misfires from this code can cause catalytic converter damage if driven — act quickly.

Frequently Asked Questions

How many cylinders does P2149 affect?

It depends on the engine. On a V8 engine, Group B typically covers 4 cylinders — half the engine. Losing power to Group B means half the cylinders stop firing. This causes severe misfires, rough running, and potential catalytic converter damage from unburned fuel.

Can a single bad injector cause P2149?

No — P2149 is a supply voltage (power side) fault, not an individual injector control fault. A single bad injector sets an individual injector code (P0201 to P0208). P2149 affects the entire Group B power supply circuit and indicates a fuse, wiring, or PCM supply driver fault.

Is it safe to drive with P2149?

No — half the cylinders may be disabled. Driving with multiple dead cylinders causes dangerous misfires and dumps raw fuel into the catalytic converter. Catalytic converter meltdown can result from extended driving with this fault. Stop driving and investigate immediately.