P0605 on 1999-2004 Jeep Grand Cherokee — Internal Control Module Read Only Memory (ROM) Error
1 vehicles · 1 makes · $300-$1,000 repair
Most Reported On
P0605 is an OBD-II diagnostic trouble code meaning “Internal Control Module Read Only Memory (ROM) Error.” The module's internal Read Only Memory (ROM), which holds the operating program/calibration, failed its self-test. The stored program is corrupt or unreadable, an internal module hardware fault. This code is most commonly reported on 1999-2004 Jeep Grand Cherokee, with repair costs ranging from $300 to $1,000.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0605, 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 P0605 mean?
P0605 stands for "Internal Control Module Read Only Memory (ROM) Error." The module's internal Read Only Memory (ROM), which holds the operating program/calibration, failed its self-test. The stored program is corrupt or unreadable, an internal module hardware fault.
What are the most common causes of P0605?
The most common causes of P0605 are: Corrupted internal ROM/program memory, Failed or interrupted reprogramming, Low/unstable voltage during operation, Internal electronic component failure, Defective control module. The specific cause varies by vehicle.
How much does it cost to fix P0605?
Repair costs for P0605 range from $300 to $1,000, depending on the vehicle and root cause.
Which vehicles are affected by P0605?
Au7o has documented P0605 across 1 vehicle models from 1 manufacturers: Jeep.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.