U1059 — SCP (J1850) Invalid or Missing Data for Transmission / Transaxle / PRNDL

vehicle network

Is it safe to drive?

Drive with caution Drive only if the transmission still shifts predictably, and avoid highway speeds. Driving with slipping or limp mode accelerates internal wear — every kilometre can add to the final repair bill.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm U1059 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many U0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the automatic transmission control for damage, corrosion, chafing or poor contact.
Subsystem check Check transmission fluid level and condition — dark, burnt fluid points to internal wear.
Subsystem check Read transmission-specific codes and live data (solenoid states, input/output speed) with a capable scanner.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm U1059 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for U1059 (parts and labor, USD, independent shop rates): Valve body repair or replacement: $700–$1,500; Transmission rebuild or replacement: $2,500–$5,500; Replace a shift solenoid: $300–$800; Transmission fluid service: $150–$350. Overall, fixing U1059 usually costs between $150 and $5,500. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

What does OBD2 code U1059 mean?

SCP (J1850) Invalid or Missing Data for Transmission / Transaxle / PRNDL (U1059): a vehicle network fault affecting the automatic transmission control. Short, gentle driving to a shop is usually possible. Most often caused by failed shift or pressure control solenoid, faulty transmission speed sensor, internal mechanical wear (clutches, torque converter).

Will U1059 clear itself?

Sometimes U1059 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What are the symptoms of U1059?

Drivers most often notice: transmission stuck in one gear (limp mode), no movement in severe cases, Check Engine or transmission warning light on, slipping between gears.

How do I diagnose U1059 myself?

Start with a scan: confirm U1059, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the automatic transmission control, and verify the suspect component against live data before buying parts.

What is the most common cause of U1059?

The most common causes are: failed shift or pressure control solenoid, faulty transmission speed sensor, internal mechanical wear (clutches, torque converter).

What does U1059 mean?

U1059 is logged by the onboard diagnostics when the automatic transmission control does not behave as expected. The official definition is “SCP (J1850) Invalid or Missing Data for Transmission / Transaxle / PRNDL”. This is a vehicle network category code.

This code does not appear from a single bad reading: the module must see the fault condition repeat under defined operating conditions before it turns on the warning light. The freeze frame captured with U1059 — engine load, rpm, temperature, speed — tells you exactly when the problem occurs, so reproduce those conditions when testing.

What causes U1059?

valve body wear
internal mechanical wear (clutches, torque converter)
low or degraded transmission fluid
faulty transmission speed sensor
wiring or connector faults in the valve body harness

Common symptoms of U1059

transmission stuck in one gear (limp mode)
no movement in severe cases
Check Engine or transmission warning light on
slipping between gears
harsh or delayed shifting

How to diagnose U1059

Connect an OBD2 scanner, confirm U1059 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many U0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Visually inspect the wiring harness and connectors related to the automatic transmission control for damage, corrosion, chafing or poor contact.
Check transmission fluid level and condition — dark, burnt fluid points to internal wear.
Read transmission-specific codes and live data (solenoid states, input/output speed) with a capable scanner.
Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm U1059 does not return.

How to fix U1059

Start with the cheapest and most common causes before replacing expensive parts:

Valve body repair or replacement — $700–$1,500
Transmission rebuild or replacement — $2,500–$5,500
Replace a shift solenoid — $300–$800
Transmission fluid service — $150–$350

How much does it cost to fix U1059?

Repair cost depends on which component actually failed. Typical scenarios for U1059 (parts and labor, USD, independent shop rates):

Valve body repair or replacement: $700–$1,500
Transmission rebuild or replacement: $2,500–$5,500
Replace a shift solenoid: $300–$800
Transmission fluid service: $150–$350

Overall, fixing U1059 usually costs between $150 and $5,500. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Can you drive with U1059?

Drive only if the transmission still shifts predictably, and avoid highway speeds. Driving with slipping or limp mode accelerates internal wear — every kilometre can add to the final repair bill.