Common Diesel Pusher Problems and How to Fix Them

A diesel pusher is a powerhouse of comfort and efficiency, ideal for long-haul road trips or full-time RV living. However, like all complex machines, diesel pushers come with their own set of challenges. From engine troubles to electrical quirks, knowing how to address these problems can save you from costly repairs and frustrating downtime. In this guide, we’ll explore the most common issues and practical solutions for keeping your diesel pusher in peak condition.

1. Engine Overheating

Overheating is one of the most frequent problems diesel pushers face, especially during long trips in hot climates. A malfunctioning cooling system is often the culprit.

Causes

• Low or contaminated coolant.
• Faulty radiator fan clutch.
• Blocked radiator fins or leaking hoses.

Solutions

• Regularly check and top off coolant levels, using the type recommended by your manufacturer.
• Inspect the radiator for blockages and clean it with a gentle water spray.
• Replace worn hoses or a faulty fan clutch promptly.

Pro Tip: Keep an extra jug of coolant onboard for emergencies.

2. Transmission Slipping

The transmission is critical for delivering smooth and efficient power, but slipping or hard shifts are a common complaint.

Causes

• Low or old transmission fluid.
• Overheating due to heavy loads or long climbs.
• Failing torque converter.

Solutions

• Check transmission fluid levels regularly and refill or replace as needed.
• Install a transmission cooler to manage heat during demanding conditions.
• Have the torque converter inspected and repaired by a qualified technician.

Quick Fix: Avoid overloading your pusher, as excess weight can strain the transmission.

3. Diesel Particulate Filter (DPF) Clogging

A clogged DPF restricts engine performance and can lead to costly repairs if not addressed promptly.

Causes

• Prolonged idling or frequent short trips that prevent proper regeneration.
• Low-quality fuel leading to excessive soot buildup.

Solutions

• Allow the regeneration cycle to complete fully by driving at highway speeds regularly.
• Use high-quality diesel fuel and consider adding a fuel treatment to minimize soot production.
• If the DPF is severely clogged, consult a professional for a forced regeneration.

4. Electrical Problems

From dimming headlights to malfunctioning appliances, electrical issues can disrupt your travels and create safety concerns.

Causes

• Weak or failing alternator.
• Corroded or loose battery connections.
• Overloaded circuits due to excess demand on the electrical system.

Solutions

• Test the alternator output and replace it if it’s not charging the battery adequately.
• Clean and tighten battery terminals.
• Upgrade your RV’s electrical system if you’ve added extra appliances.

Pro Tip: Carry a multimeter to diagnose basic electrical issues on the go.

5. Suspension Sag or Rough Rides

A diesel pusher’s suspension is critical for carrying its heavy weight and ensuring a smooth ride. Problems here can make your trips uncomfortable and unsafe.

Causes

• Worn air suspension bags.
• Faulty shocks or struts.
• Uneven weight distribution.

Solutions

• Inspect and replace air suspension bags that show signs of wear or leakage.
• Upgrade to heavy-duty shocks designed for RVs.
• Load your pusher evenly to reduce stress on the suspension system.

Quick Tip: Perform regular weight checks at truck stops to ensure proper distribution.

6. Fuel System Issues

Fuel delivery problems can lead to rough idling, stalling, or poor fuel economy.

Causes

• Clogged fuel filters.
• Air in the fuel lines.
• Failing fuel pump.

Solutions

• Replace fuel filters according to your maintenance schedule or earlier if symptoms arise.
• Bleed the fuel lines to remove trapped air after repairs or fuel changes.
• Have your fuel pump inspected and replaced by a professional if needed.

Pro Tip: Keep a spare fuel filter onboard for emergencies.

7. Exhaust and Emissions Troubles

Diesel pushers must meet strict emissions standards, and problems in this system can impact performance and compliance.

Causes

• Faulty EGR valve.
• DEF (Diesel Exhaust Fluid) system errors.
• Cracked or leaking exhaust manifolds.

Solutions

• Clean or replace a clogged EGR valve.
• Ensure your DEF tank is full and use high-quality DEF to avoid injector clogs.
• Repair or replace damaged exhaust components promptly.

Final Thoughts

Diesel pushers are remarkable machines, but they need regular care and attention to keep running smoothly. Addressing issues like overheating, transmission troubles, and electrical quirks early can save you time, money, and headaches down the road.

At Saviors Repair in Pearland, Texas, we specialize in diagnosing and repairing diesel pusher problems. Contact us today for expert service to keep your RV rolling safely and efficiently!