U0002-88 Error Code on 2017 Dodge RAM 1500: ABS and CAN Bus Communication Issue with No Check Engine Light

This U0002-88 code typically indicates a communication failure on the high-speed CAN bus. It may be caused by electrical interference from aftermarket accessories or issues with the BlueDriver tool's email reporting setup. There is no known 'on/off' switch for the CAN bus in standard vehicles — it must be resolved through diagnostics, not manual intervention.

Thanks for the input! I'll start by checking for any aftermarket devices or wiring that could cause interference and inspect the ABS module connector for corrosion. I've had similar symptoms on my 2017 RAM 1500 — the ABS and traction lights would flicker intermittently before becoming constant. After a recent brake service, they’ve stayed on continuously. I'll also verify the ABS fuses and monitor any changes over the coming week.

I've been trying to resolve this issue with my 2017 RAM 1500 as well. I took it to a Dodge dealership for a 40K service, and they didn't mention the U0002-88 code even though BlueDriver confirms its presence. When I asked them if they could fix it, they said only certain Dodge dealerships have the expertise to interpret or resolve network communication errors like this — which is concerning given how critical ABS systems are.

It's essential to scan all vehicle modules for CAN bus communication issues. A reliable OBD2 scanner capable of module-level diagnostics is necessary. Many dealerships lack the tools or training to interpret complex network errors — this is a known issue in Dodge vehicles, especially older models with CAN-based systems.

I've experienced intermittent gear shifting issues and rapid shifter blinking on my RAM 1500. Last year I received U0002-88 — 'CAN Bus Off' — and when I disconnected the ABS module, the truck wouldn't start at all. The issue seems to worsen in summer months. I'm now considering using a heat gun to test if thermal expansion affects the ABS module. Mechanics often say intermittent CAN problems are among the hardest to diagnose due to environmental sensitivity. It's frustrating — especially when the vehicle won’t start without the ABS system.

I'm sorry to hear about your experience — it sounds like a serious issue. A 'Bus Off' condition on the CAN bus can disable critical safety systems and may even prevent engine operation in some cases, which is alarming for vehicle reliability.

My truck shows code P0004 — Fuel Volume Regulator Control Circuit High. When the truck won’t turn over at all, what could be causing this? Any advice on troubleshooting?

Here's a breakdown of the P0004 error code (Fuel Volume Regulator Control Circuit): - This is a generic OBD-II powertrain code applicable to vehicles including Dodge, Ford, VW, Mazda, and others. - It commonly appears in diesel or GDI engines with high-pressure fuel systems. - The issue relates to an electrical fault in the fuel volume regulator (FVR) circuit — such as a failed solenoid or damaged wiring. Symptoms may include: MIL illumination, inability to start, limp mode, or lack of power. Potential causes: - Failed FVR solenoid - Corroded or damaged wiring/harness Recommended steps: 1. Check for known Technical Service Bulletins (TSBs) for your 2017 RAM 1500. 2. Visually inspect the FVR wiring and connectors for damage, corrosion, or loose connections. 3. Avoid applying direct battery voltage to any fuel system wires — this can cause permanent damage. Refer to a factory service manual for model-specific troubleshooting steps. This code is not common but should be addressed promptly.

Here is all you need to know about the P0004 error code (Fuel Volume Regulator Control Circuit) High OBD-II Trouble Code Technical Description Fuel Volume Regulator Control Circuit High What does that mean? This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles, including but not limited to Ford, Dodge, Vauxhall, VW, Mazda, etc. Although generic, the specific repair steps may vary depending on make/model. A P0004 is not a very common trouble code and is more often seen on common rail diesel (CRD) and/or diesel engine, and gasoline direct injection (GDI) equipped vehicles. This code relates to the the electrical system as part of the fuel volume regulator system. Automotive fuel systems consist of many components, the fuel tank, fuel pump, filter, lines, injectors, etc. One component in high pressure fuel systems is a high pressure fuel pump. It's job is to increase the fuel pressure for the very high pressure needed at the fuel rail for the injectors. These high pressure fuel pumps have a low pressure side and high pressure side, and a fuel volume regulator which controls the pressure. For this P0004 code, it refers to an electrical reading that is above expected parameters. This code is related to P0001, P0002, and P0003. Symptoms of a P0004 DTC may include: Malfunction indicator lamp (MIL) illumination Vehicle won't start "Limp mode" enabled and/or lack of power Potential Causes Potential causes of this engine code may include: Failed fuel volume regulator (FVR) solenoid FVR wiring/harness electrical problem (wiring short, corrosion, etc.) Possible Solutions: First, check for known Technical Service Bulletins (TSBs) for your year/make/model. If there is a known TSB that addresses this issue, it can save you time & money during diagnosis. Next, you'll want to visually inspect the wiring and connectors pertaining to the fuel volume regulator circuit and system. Look for obvious breaks in the wires, corrosion, etc. Repair as necessary. The fuel volume regulator (FVR) is a two-wire device with the wires both going back to the PCM. You should not apply direct battery voltage to the wires or you could damage the system. Refer to a factory service manual for more specific troubleshooting steps for your year/make/model/engine. Related DTC Discussions Read more: p0004