P2155 — Fuel Injector Group "D" Supply Voltage Circuit/Open

OBD2 code P2155 flags a problem with the fuel delivery and mixture control (fuel injector group "D" supply voltage circuit/open). Short, gentle driving to a shop is usually possible. Common culprits: faulty fuel rail pressure sensor or wiring, weak fuel pump or clogged fuel filter, clogged or leaking fuel injectors.

powertrain (engine/transmission)

Is it safe to drive?

Drive with caution Drive with caution. Mixture and fuel-pressure faults can cause stalling, hesitation in traffic and — when severe — catalyst damage. Avoid long trips until diagnosed.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm P2155 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
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.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the fuel delivery and mixture control for damage, corrosion, chafing or poor contact.
Subsystem check Measure fuel pressure at the rail and compare with factory specification at idle and under load.
Subsystem check Check short-term and long-term fuel trims in live data to see which way the mixture is off.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2155 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P2155 (parts and labor, USD, independent shop rates): Clean or replace injectors: $200–$800; Replace the fuel filter: $80–$200; Replace the fuel pump: $400–$900; Replace the pressure regulator or sensor: $150–$450. Overall, fixing P2155 usually costs between $80 and $900. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

Will P2155 clear itself?

Sometimes P2155 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What is the most common cause of P2155?

The most common causes are: faulty fuel rail pressure sensor or wiring, weak fuel pump or clogged fuel filter, clogged or leaking fuel injectors.

How do I diagnose P2155 myself?

Start with a scan: confirm P2155, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the fuel delivery and mixture control, and verify the suspect component against live data before buying parts.

Is it safe to drive with P2155?

Drive with caution. Mixture and fuel-pressure faults can cause stalling, hesitation in traffic and — when severe — catalyst damage. Avoid long trips until diagnosed.

What are the symptoms of P2155?

Drivers most often notice: rough idle and hesitation, loss of power under load, hard starting or long cranking, increased fuel consumption.

What does P2155 mean?

When P2155 appears on a scan, it means the control module has flagged a problem in the fuel delivery and mixture control: fuel injector group "D" supply voltage circuit/open. The fault sits in the powertrain (engine/transmission) group of the OBD2 standard.

To set P2155, the control module compares live readings of the fuel delivery and mixture control against calibrated limits, usually over several drive cycles. Alongside the code it stores a freeze frame — a snapshot of rpm, load, coolant temperature and vehicle speed at the moment of failure. Reading that snapshot first saves diagnostic time.

What causes P2155?

faulty fuel pressure regulator
vacuum or intake leaks skewing the mixture
clogged or leaking fuel injectors
weak fuel pump or clogged fuel filter
faulty fuel rail pressure sensor or wiring

Common symptoms of P2155

rough idle and hesitation
loss of power under load
hard starting or long cranking
increased fuel consumption
fuel smell in severe cases
Check Engine Light on

How to diagnose P2155

Connect an OBD2 scanner, confirm P2155 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
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.
Visually inspect the wiring harness and connectors related to the fuel delivery and mixture control for damage, corrosion, chafing or poor contact.
Measure fuel pressure at the rail and compare with factory specification at idle and under load.
Check short-term and long-term fuel trims in live data to see which way the mixture is off.
Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2155 does not return.

How to fix P2155

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

Clean or replace injectors — $200–$800
Replace the fuel filter — $80–$200
Replace the fuel pump — $400–$900
Replace the pressure regulator or sensor — $150–$450

How much does it cost to fix P2155?

Repair cost depends on which component actually failed. Typical scenarios for P2155 (parts and labor, USD, independent shop rates):

Clean or replace injectors: $200–$800
Replace the fuel filter: $80–$200
Replace the fuel pump: $400–$900
Replace the pressure regulator or sensor: $150–$450

Overall, fixing P2155 usually costs between $80 and $900. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Can you drive with P2155?