P2623 — Injector Control Pressure Regulator Circuit/Open
OBD2 code P2623 flags a problem with the fuel delivery and mixture control (injector control pressure regulator circuit/open). Short, gentle driving to a shop is usually possible. Common culprits: clogged or leaking fuel injectors, contaminated or incorrect fuel, vacuum or intake leaks skewing the mixture.
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 P2623 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 P2623 does not return.
Approximate repair cost
Repair cost depends on which component actually failed. Typical scenarios for P2623 (parts and labor, USD, independent shop rates): Replace the pressure regulator or sensor: $150–$450; Replace the fuel filter: $80–$200; Replace the fuel pump: $400–$900; Clean or replace injectors: $200–$800. Overall, fixing P2623 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
How much does it cost to fix P2623?
Replace the pressure regulator or sensor — $150–$450; Replace the fuel filter — $80–$200; Replace the fuel pump — $400–$900; Clean or replace injectors — $200–$800. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.
Will P2623 clear itself?
Sometimes P2623 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 are the symptoms of P2623?
Drivers most often notice: fuel smell in severe cases, Check Engine Light on, hard starting or long cranking, loss of power under load.
What is the most common cause of P2623?
The most common causes are: clogged or leaking fuel injectors, contaminated or incorrect fuel, vacuum or intake leaks skewing the mixture.
How do I diagnose P2623 myself?
Start with a scan: confirm P2623, 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.
What does P2623 mean?
Behind P2623 is a specific failure in the fuel delivery and mixture control: injector control pressure regulator circuit/open. The onboard computer stores it in the powertrain (engine/transmission) group after verifying the fault over repeated checks.
This code does not appear from a single bad reading: the module must see the fault condition repeat under defined operating conditions before it turns on the warning light. The freeze frame captured with P2623 — engine load, rpm, temperature, speed — tells you exactly when the problem occurs, so reproduce those conditions when testing.
Common symptoms of P2623
- fuel smell in severe cases
- Check Engine Light on
- hard starting or long cranking
- loss of power under load
- rough idle and hesitation
- increased fuel consumption
What causes P2623?
- faulty fuel pressure regulator
- weak fuel pump or clogged fuel filter
- vacuum or intake leaks skewing the mixture
- clogged or leaking fuel injectors
- faulty fuel rail pressure sensor or wiring
- contaminated or incorrect fuel
How to diagnose P2623
- Connect an OBD2 scanner, confirm P2623 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 P2623 does not return.
How to fix P2623
Start with the cheapest and most common causes before replacing expensive parts:
- Replace the pressure regulator or sensor — $150–$450
- Replace the fuel filter — $80–$200
- Replace the fuel pump — $400–$900
- Clean or replace injectors — $200–$800
How much does it cost to fix P2623?
Repair cost depends on which component actually failed. Typical scenarios for P2623 (parts and labor, USD, independent shop rates):
- Replace the pressure regulator or sensor: $150–$450
- Replace the fuel filter: $80–$200
- Replace the fuel pump: $400–$900
- Clean or replace injectors: $200–$800
Overall, fixing P2623 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 P2623?
Drive with caution. Mixture and fuel-pressure faults can cause stalling, hesitation in traffic and — when severe — catalyst damage. Avoid long trips until diagnosed.