P0603 1998 Ford F150 Code - Powertrain Control Module KAM Test Error
Quick Answer
Battery voltage is supplied to the ECM even when the ignition switch is turned OFF for the ECM memory function of the DTC memory, the air-fuel ratio feedback compensation value memory, the idle air volume learning value memory, etc. Common causes include Loose or poor battery terminal connection, Low battery charge (Battery terminal corrosion), ECM power supply circuit is open or shorted. 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
- P0603 1998 Ford F150 indicates Powertrain Control Module KAM Test Error .
- Common causes
- Common causes include Loose or poor battery terminal connection, Low battery charge (Battery terminal corrosion), ECM power supply circuit is open or shorted.
- 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 P0603 1998 Ford F150 Description
What are the Possible Causes of the DTC P0603 1998 Ford F150?
- Loose or poor battery terminal connection
- Low battery charge (Battery terminal corrosion)
- ECM power supply circuit is open or shorted
- ECM Programing
- Faulty PCM
How to Fix the DTC P0603 1998 Ford F150?
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.
Code Tech Notes
Indicates the PCM has experienced an internal memory fault. However there are external items that can cause this DTC.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0603 1998 Ford F150 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 P0603 1998 Ford F150 Code
What does the OBDII code P0603 mean for a 1998 Ford F150?
The P0603 code indicates a "Powertrain Control Module (PCM) KAM Test Error," meaning the Keep-Alive Memory (KAM) in the PCM has encountered an issue, often related to power supply or internal memory failure.
What are the common symptoms of a P0603 code?
Symptoms may include the check engine light turning on, rough idling, poor fuel economy, erratic transmission shifting, or loss of engine performance.
What causes the P0603 code to appear?
Common causes include a disconnected or weak battery, faulty PCM, corroded or loose battery terminals, bad PCM power or ground connections, or a recent battery or PCM reset.
Can a weak battery trigger the P0603 code?
Yes, a weak or failing battery can cause voltage inconsistencies that affect the PCM's ability to retain Keep-Alive Memory, triggering the code.
How do I troubleshoot the P0603 code on my 1998 Ford F150?
Start by checking the battery condition, battery terminals, and wiring connections. Ensure proper voltage supply to the PCM and inspect for any recent resets or interruptions to the electrical system.
Does the P0603 code always mean the PCM is bad?
No, while a faulty PCM can cause this code, it is more often due to a weak battery, bad connections, or recent power resets. Diagnosing the root cause is essential before replacing the PCM.
Can I drive my 1998 Ford F150 with a P0603 code?
In most cases, the truck will still drive, but you may experience reduced performance or erratic behavior. It’s best to address the issue promptly to avoid potential further damage.
How do I reset the P0603 code after repairs?
Use an OBDII scanner to clear the code once the underlying issue is fixed. If the problem persists, the code may reappear.
How much does it cost to fix the P0603 code?
The cost depends on the root cause. Battery replacement may cost $100-$200, while PCM replacement or reprogramming can range from $500-$1,200.
Can a recent battery replacement cause the P0603 code?
Yes, disconnecting or replacing the battery can cause a temporary loss of Keep-Alive Memory, which may trigger the P0603 code.
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