1. Engine Cylinder #4 Misfire

A misfiring engine isn’t just annoying. It wastes fuel, kills power, and if ignored, can destroy an engine. On 2006 Honda Ridgeline models, the most common misfire occurs in cylinder #4 around 100,000 miles. Owners report rough idling, hesitation, and a flashing check engine light.

The issue is often tied to Honda’s Variable Cylinder Management (VCM) system. This system deactivates certain cylinders for fuel efficiency, but over time, it leads to carbon buildup on valves and pistons. Excess deposits disrupt combustion, creating an imbalance that triggers a misfire. Failing ignition coils and clogged fuel injectors can also contribute.

At Precision Auto Care, we don’t just clear the error code and send you on your way. We perform a compression test to check for weak cylinders, inspect the ignition system for coil failure, and clean the fuel injectors. If we find carbon buildup, we use a high-pressure intake cleaning process to restore combustion efficiency. In severe cases, we may recommend a valve adjustment or cylinder head repair. Regular use of top-tier fuel and periodic fuel system cleanings can help prevent this problem.

2. Transmission Slipping and Hard Shifting

The Ridgeline’s five-speed automatic transmission is generally reliable, but 2006-2007 models are prone to harsh shifting, gear slipping, and delayed engagement. Drivers often report shuddering between 35-45 mph and difficulty shifting into fourth gear.

The primary culprit is fluid breakdown. Over time, old transmission fluid loses its lubricating properties, leading to internal overheating and pressure loss. Failing pressure control solenoids and a worn torque converter clutch can also cause erratic shifting.

We start with a fluid analysis to check for contamination. If the fluid is burnt or filled with metal shavings, it’s time for a full transmission flush with Honda ATF-Z1 or DW-1 fluid. If slipping persists, we inspect the pressure control solenoids and torque converter. A failing solenoid can sometimes be replaced, but a damaged torque converter often requires a full rebuild. We advise owners to change transmission fluid every 30,000-40,000 miles to keep these problems at bay.

3. Tailgate Latch Failure

The Ridgeline’s dual-action tailgate is one of its standout features. It swings open and drops down—until it stops working. Owners of 2006-2010 and 2017 models frequently experience tailgate latch failure, making access to the truck bed difficult or impossible.

This problem is usually caused by a failing latch mechanism or sensor rod. Over time, dirt and corrosion cause the latch to stick or break altogether. If the tailgate handle becomes loose or unresponsive, the problem has likely progressed.

At Precision Auto Care, we begin by testing the tailgate release handle and latch rod for binding. A stuck latch can sometimes be fixed with a deep clean and lubrication, but if parts are worn, we replace them entirely. A new latch and actuator assembly ensures smooth operation for years to come. Applying lithium grease to moving parts helps prevent future failures.

4. Air Conditioning and Heater Malfunctions

The Ridgeline’s climate control system should keep the cabin comfortable in any weather, but 2008 models frequently suffer from weak A/C performance or total HVAC failure.

The most common causes are a failing blower motor, a faulty control module, or a clogged air blend door actuator. Some owners report that the heater blows cold air, even when set to high. This is often due to low coolant levels or a malfunctioning thermostat.

We diagnose HVAC issues by first testing blower motor voltage and checking the climate control module for fault codes. If the issue is with the actuator, we replace it with a Honda OEM unit. In cases where the system isn’t producing heat, we inspect the cooling system for leaks or blockages. To keep the system running efficiently, we recommend changing the cabin air filter every 15,000 miles.

5. Premature Fuel Injector Failure

The 2017 Ridgeline introduced Honda’s direct fuel injection system, which improves efficiency but comes with a cost: fuel injectors that fail prematurely. Some owners experience injector failure as early as 50,000 miles, leading to engine stumbling, hesitation, and reduced fuel economy.

Carbon buildup is the leading cause. Unlike older port-injected engines, direct injection sprays fuel directly into the combustion chamber, which allows carbon deposits to form on the injector nozzles.

Our repair process starts with a fuel pressure test and an injector balance test to pinpoint faulty units. We replace failing injectors with Honda-certified replacements and update the engine control module (ECM) to recalibrate the system. To extend injector life, we advise using top-tier fuel and periodic intake valve cleanings.

6. Electrical System Failures

Ridgelines are packed with electronics, and that means electrical gremlins. Owners report flashing warning lights, dead instrument clusters, and intermittent sensor failures.

These problems often stem from wiring harness corrosion, loose connections, or ECU glitches. The forward collision warning system and ABS sensors are particularly prone to faulty readings due to degraded wiring insulation.

We diagnose electrical issues using Honda’s HDS diagnostic tool. If a sensor failure is detected, we inspect the wiring harness for damage and perform continuity tests to locate breaks. In some cases, an ECU update or software reflash resolves the issue.

7. Rear-View Camera Failure

Many 2017-2019 Ridgeline models suffer from rear-view camera failure, an issue serious enough to prompt an NHTSA investigation. Owners report blurry images, flickering screens, or total camera loss.

The root cause is a damaged tailgate wiring harness. The constant opening and closing of the tailgate eventually frays the wires, cutting off power to the camera.

We inspect the camera harness for damage and replace any frayed sections with reinforced wiring. If the camera itself has failed, we install an OEM replacement unit. To prevent further wear, we secure the new harness in a protected routing path.

Precision Auto Care: Fixing Ridgelines the Right Way

At Precision Auto Care, we don’t guess—we diagnose. Whether it’s a misfiring engine, a slipping transmission, or a failing electrical system, we have the expertise to keep your Honda Ridgeline running strong.

Don’t wait for a breakdown. If your Ridgeline isn’t performing the way it should, call us today. We proudly serve San Leandro, Hayward, San Lorenzo, and Castro Valley. Let’s keep your truck in top shape for the road ahead.