Packard Super U1859 Engine Trouble Code
What is Packard Super U1859?
Packard Super U1859 indicates potential catalytic converter failure. If completely failed, your vehicle may not run properly and fuel economy will suffer significantly. Average replacement cost is $2,000–$2,140. This repair requires professional service and should not be delayed.
U1859 on the Packard Super
Transmission-mounted speed sensors on the Packard Super share a ground path with the engine control module. A corroded ground point on the transmission bell housing generates electrical noise that the ECU misinterprets as a U1859 fault condition.
Code Information
| Code Type: | OBD-II Network (U) Trouble Code |
| System: | Network |
| Vehicle: | Packard Super |
| Brand: | Packard |
| Model: | Super |
| Code: | U1859 |
U1859 Packard Super Symptoms
Check Engine Light
Illuminated Packard Super dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Packard Super
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Packard Super
Increased Emissions
Failed emissions test due to U1859
U1859 Code Structure
Understanding what each digit means in the U1859 network trouble code:
| U | 1 | 8 | 5 | 9 |
|---|---|---|---|---|
| Network Code | Fuel And Air Metering | Engine Oil Temperature Sensor Malfunction | Cylinder 1 Injector Circuit Low | Reverse Input Circuit |
How to Fix Packard Super U1859
Diagnostic Steps:
The catalytic converter has oxygen sensors before and after it. When warm and in closed-loop mode, the upstream O2 sensor reading should fluctuate, while downstream should remain steady.
Repair Solution:
Verify all electrical connections are clean and tight. Check for damaged wiring, especially in high-heat or high-vibration areas. Use manufacturer wiring diagrams for accurate diagnosis.
Technical Notes:
U1859 on electronically controlled automatic transmissions relates to shift solenoid operation. The solenoid actuates hydraulic circuits controlling clutches or bands for gear changes.
Packard Super U1859 Repair Cost
ECU software update for the Packard Super to resolve the U1859 calibration bug is performed free of charge at a franchised Packard dealer under the technical service bulletin programme. Always confirm the ECU part number and current flash version before spending money on sensors.
U1859 Description
U1859 engine trouble code is related to Reverse Input Circuit.
Main Cause
The primary reason for U1859 OBD-II Engine Trouble Code is: Engine Oil Temperature Sensor Malfunction.
Common U1859 Misdiagnosis on the Packard Super
A frequent misdiagnosis on the Packard Super is replacing the oxygen sensor when U1859 appears, only for the code to return within days. The actual cause is usually an exhaust manifold gasket leak introducing false air before the upstream O2 sensor — a much cheaper fix.
DIY Repair Guide: U1859 on Packard Super
For the mechanically confident Packard Super owner, a DIY MAF sensor clean is a rewarding first step for U1859. Use a dedicated MAF sensor cleaner spray — not brake cleaner, which damages the sensing element — and allow the sensor to dry for 30 minutes before reinstallation.
Preventing U1859 on the Packard Super
For diesel Packard Super owners, a DPF (Diesel Particulate Filter) regeneration run on the motorway every 500 miles prevents soot blockage that back-pressures the exhaust and forces U1859 flags via the pressure differential sensors.
Frequently Asked Questions — Packard Super U1859
A: Simple fixes like a purge valve or gas cap replacement take under an hour. Sensor replacements typically require 1–2 hours of shop time. More involved repairs like VVT actuators or catalytic converters may require a full day or more.