P0603 on 2022-2024 Nissan Frontier — Internal Control Module Keep Alive Memory (KAM) Error
1 vehicles · 1 makes · $150-$900 repair
Most Reported On
P0603 is an OBD-II diagnostic trouble code meaning “Internal Control Module Keep Alive Memory (KAM) Error.” This code means the engine computer's keep-alive memory (KAM), which stores learned adaptive values and settings between key cycles, has failed an internal check. The PCM relies on this memory to retain fuel trims, idle learning, and other adaptations. A KAM error can cause rough running, poor fuel economy, or transmission shift issues until the module relearns or is repaired. This code is most commonly reported on 2022-2024 Nissan Frontier, with repair costs ranging from $150 to $900.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0603, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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FAQ
What does P0603 mean?
P0603 stands for "Internal Control Module Keep Alive Memory (KAM) Error." This code means the engine computer's keep-alive memory (KAM), which stores learned adaptive values and settings between key cycles, has failed an internal check. The PCM relies on this memory to retain fuel trims, idle learning, and other adaptations. A KAM error can cause rough running, poor fuel economy, or transmission shift issues until the module relearns or is repaired.
What are the most common causes of P0603?
The most common causes of P0603 are: Loss of constant battery power to the PCM (blown fuse, bad connection), Weak or failing battery, Corroded or loose battery/ground connections, Recent battery disconnection without relearn, Internal PCM fault, Damaged PCM power/ground wiring. The specific cause varies by vehicle.
How much does it cost to fix P0603?
Repair costs for P0603 range from $150 to $900, depending on the vehicle and root cause.
Which vehicles are affected by P0603?
Au7o has documented P0603 across 1 vehicle models from 1 manufacturers: Nissan.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.