P1555 Chevrolet Code - Electronic Variable Orifice Output
Quick Answer
With the engine runtime over 2.5 seconds, vehicle speed over 10 mph, current flowing in Electronic Variable Orifice (EVO) solenoid (to increase steering effort), the Powertrain Control Module (PCM) detects that desired and feedback current did not match. Common causes include Faulty Electronic Variable Orifice (EVO) solenoid, Electronic Variable Orifice (EVO) solenoid harness is open or shorted, Electronic Variable Orifice (EVO) solenoid circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1555 Chevrolet indicates Electronic Variable Orifice Output.
- Common causes
- Common causes include Faulty Electronic Variable Orifice (EVO) solenoid, Electronic Variable Orifice (EVO) solenoid harness is open or shorted, Electronic Variable Orifice (EVO) solenoid circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1555 Chevrolet Description
What are the Possible Causes of the DTC P1555 Chevrolet?
- Faulty Electronic Variable Orifice (EVO) solenoid
- Electronic Variable Orifice (EVO) solenoid harness is open or shorted
- Electronic Variable Orifice (EVO) solenoid circuit poor electrical connection
How to Fix the DTC P1555 Chevrolet?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1555 Chevrolet code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1555 Chevrolet Code
Q: What does the OBDII code P1555 mean on a Chevrolet?
A: Code P1555 indicates an issue with the Electronic Variable Orifice (EVO) system, which controls the power steering assist based on vehicle speed.
Q: What are common symptoms of P1555 on a Chevrolet?
A: Symptoms may include heavy or inconsistent steering effort, loss of speed-sensitive power steering assist, or the illumination of the check engine light.
Q: What causes the P1555 code to appear on a Chevrolet?
A: Common causes include a faulty EVO actuator, damaged wiring or connectors, or problems with the power steering control module.
Q: Can I drive my Chevrolet with the P1555 code active?
A: While the vehicle may still be drivable, the steering may feel different or less responsive, which can pose safety risks, especially at higher speeds.
Q: How is the P1555 code diagnosed?
A: A mechanic uses an OBDII scanner to confirm the code, checks the EVO system components, inspects wiring and connectors, and tests the power steering control module.
Q: What repairs are typically needed to fix the P1555 code on a Chevrolet?
A: Repairs may include replacing the EVO actuator, repairing damaged wiring, or replacing the power steering control module if necessary.
Q: Is the P1555 code specific to certain Chevrolet models?
A: Yes, it is more common in older Chevrolet models equipped with the EVO system for speed-sensitive steering.
Q: Can a bad power steering fluid affect the P1555 code?
A: While not a direct cause, dirty or low power steering fluid can strain the system and exacerbate underlying issues tied to the EVO system.
Q: How much does it cost to repair the P1555 code on a Chevrolet?
A: Repair costs vary but can range from $100 to $500, depending on whether the issue is with the actuator, wiring, or control module.
Q: How can I prevent the P1555 code from appearing again?
A: Regular maintenance of the power steering system, including fluid checks and inspections of wiring and connectors, can help prevent recurrence.
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