Acura Cl B2594 Engine Trouble Code
What is Acura Cl B2594?
When Acura Cl B2594 code appears, first check your gas cap. Pull over safely, ensure it is tight, and inspect for cracks. A loose or damaged gas cap affects fuel-system pressure and emissions. A replacement cap costs about $3–$10. This simple fix can resolve the code and improve fuel economy.
B2594 on the Acura Cl
In cold climates, Acura Cl vehicles frequently log B2594 during the first winter of ownership. Condensation inside the throttle body creates a temporary short circuit in the position sensor wiring, which clears once the engine warms up — but the fault code remains stored.
Code Information
| Code Type: | OBD-II Body (B) Trouble Code |
| System: | Body |
| Vehicle: | Acura Cl |
| Brand: | Acura |
| Model: | Cl |
| Code: | B2594 |
B2594 Acura Cl Symptoms
Check Engine Light
Illuminated Acura Cl dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Acura Cl
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Acura Cl
Increased Emissions
Failed emissions test due to B2594
B2594 Code Structure
Understanding what each digit means in the B2594 body trouble code:
| B | 2 | 5 | 9 | 4 |
|---|---|---|---|---|
| Body Code | Fuel And Air Metering (Injector Circuit Malfunctions Only) | Fuel Composition Sensor Circuit Malfunction | Crankshaft Position Sensor A Circuit Malfunction | Timing Reference High Resolution Signal A Too Many Pulses |
How to Fix Acura Cl B2594
Diagnostic Steps:
Oxygen sensors measure exhaust gas oxygen content to optimise air-fuel ratio. This optimisation improves fuel economy and reduces emissions. Sensors degrade over time and require periodic replacement.
Repair Solution:
Disconnected, dirty, or fouled spark plugs commonly prevent proper engine operation. Replace spark plugs every season or 25 hours. Verify proper spark plug gap. If plugs are good, check ignition components: spark plug wires, coils, and ignition module.
Technical Notes:
Parts or components should not be replaced based solely on B2594 DTC. Consult your vehicle service manual for proper diagnostic procedures, possible causes, and required testing before replacement.
Acura Cl B2594 Repair Cost
Fuel injector cleaning service on the Acura Cl costs $150–$300 for an ultrasonic bench-clean of all injectors with flow-test certification. On-car induction cleaning is a cheaper ($80–$120) first step but is less thorough for heavily fouled injectors.
B2594 Description
B2594 engine trouble code is related to Timing Reference High Resolution Signal A Too Many Pulses.
Main Cause
The primary reason for B2594 OBD-II Engine Trouble Code is: Fuel Composition Sensor Circuit Malfunction.
Common B2594 Misdiagnosis on the Acura Cl
The Acura Cl knock sensor shares its harness with the coolant temperature sensor. A corroded shared ground causes both sensors to report out-of-range values simultaneously, leading to misdiagnosis of B2594 as a knock sensor fault when the root cause is the shared ground splice.
DIY Repair Guide: B2594 on Acura Cl
When attempting DIY diagnosis of B2594 on your Acura Cl, a smoke machine test is the gold standard for finding vacuum leaks. Rental tools are available from most auto parts stores for $0–$20/day, or you can fabricate a makeshift tester using a hand vacuum pump and soapy water spray.
Preventing B2594 on the Acura Cl
Verify that the Acura Cl engine air box lid clips are fully seated after any air filter service. An unsealed air box is a direct path for unmetered air past the MAF sensor and is an extremely common — and extremely embarrassing — cause of B2594.
Frequently Asked Questions — Acura Cl B2594
A: Clearing the code without repair allows the fault condition to persist. Depending on the cause, this can lead to catalytic converter damage, increased fuel consumption, and secondary component failures that are significantly more expensive to address than the original fault.