OBD-II Diagnostic Trouble Code
B1342 — EEPROM Memory Failure
B1342 is a manufacturer-specific code, commonly used by Ford, meaning the module that set it found an internal memory (EEPROM or non-volatile memory) fault. The module can no longer reliably store or read its configuration or learned data. The module usually needs reprogramming or replacement.
Severity 3/5
Truck-relevant
Service this week
Severity
Service this week
EEPROM Memory Failure
Code
B1342
Category
Body
Subsystem
Network
Truck-relevant
Yes
What this means for truckers
Service within a few days on a Cummins X15, Detroit DD15, PACCAR MX-13. Performance is likely degraded. Continuing to drive without service risks additional component damage.
Before you replace parts — try this first
B1342 on the Network system is most often internal memory failure in the reporting module — not a dead part. On commercial diesels especially, work these in order before spending money on parts:
- Confirm the symptoms. Match what your truck is doing to the Symptoms section below. If the code is set but the symptoms are not there, clear the code and re-test after a drive cycle — it may not return.
- Clean and dry the sensor connector. Water, road salt, or oil seeping into a connector is the #1 fake sensor failure. Disconnect, look for green corrosion or moisture, spray with electrical contact cleaner, dry, reseat. Many faults clear here for $0.
- Inspect the wiring harness. Trace the wire from the sensor toward the ECM — look for chafing against the engine block, melted insulation near the turbo or exhaust, or pinch points where a clamp has rubbed through.
- Test the sensor before swapping it. Most Common Causes (below) list the expected voltage or resistance range — a $20 multimeter saves a $300 sensor swap that does not fix the problem.
- Only then, replace the part. Use the OEM or a tier-1 aftermarket. Cheap sensors throw the same code in two weeks.
Symptoms
Symptoms depend on which module stored the code: lost settings, features not working, warning lamps, or a module that will not communicate. Sometimes it is only a stored code alongside other faults from the same module.
Common causes
- CommonInternal memory failure in the reporting module ($400–$1500)
- OccasionalCorrupted data from an interrupted programming session or a voltage spike ($120–$300)
- OccasionalUnstable supply voltage or poor ground at the module ($50–$300)
How to fix
Identify which module set the code and check its power and ground
When to use: First step
Reflash or reprogram the module with OEM software and clear the code
When to use: When the code followed a programming or voltage event
Replace the module and program or configure it to the vehicle
When to use: When the code returns as current after reprogramming
Affects most
No specific vehicle pattern found in our complaint database. This code can appear on any vehicle that supports OBD-II diagnostics.
Related
Frequently Asked Questions
Can I drive with code B1342?
B1342 is severity 3 — plan service within a few days. Performance is likely degraded already (you may feel reduced power, harsher shifts, or slightly worse fuel economy). Continuing to drive risks additional damage to adjacent components.
How much does it cost to fix B1342 on a commercial truck?
Total repair cost ranges $50–$1500 depending on the root cause. The cheapest fix is usually the first one listed below — Internal memory failure in the reporting module — which is also the most common. On commercial trucks the cost is usually higher than passenger vehicles due to part availability and shop labor rates ($120–185/hour at most truck shops, vs $90–130 at general auto shops). DIY-capable fixes (sensors, hoses, filters) are at the low end; major component replacements (turbo actuator, high-pressure fuel pump, transmission solenoid pack) are at the high end. Always diagnose with a scan tool BEFORE replacing parts — guessing wrong on a $1,500 turbo actuator when the actual issue was a $30 boost hose is a common expensive mistake.
Will B1342 fail a DOT inspection?
B1342 is generally not a direct DOT inspection fail item by itself. Inspectors focus on safety-critical systems (brakes, steering, tires, lights, hours-of-service). However, the check engine light alone can trigger additional inspection scrutiny. Best practice: fix the code and clear it before a planned inspection.
What's the difference between B1342 and related codes?
B1342 is closely related to: B1318 (Battery Voltage Low), B1380 (PCM Pinion Factor Not Programmed). These codes share the same subsystem (network) and often appear together. If you see this code, scan for the full code list — fixing the root cause usually clears multiple companion codes at once. If only B1342 is set without the companions, the issue is more isolated.
How do I prevent B1342 from coming back after a repair?
For B1342 (EEPROM Memory Failure), prevention centers on the network system. Pay attention to ground connections at every PM — bad grounds are 70% of communication codes. Inspect harness routing for chafe points. Don't disconnect modules with the key on.